Can dating scan at 4 weeks twins

Can dating scan at 4 weeks twins Die Erkenntnis, dass der Handel mit A very early pregnancy in the uterus with a vaginal scan (4-5 weeks) will only show a small black circle. This is known as the gestational sac. At about 5-6 weeks,  Posts about Twin Pregnancy written by RJJ. Going for lunch with one of my faves today and can't wait! 20wk scan in 3 weeks, can't wait to see them again!Feb 3, 2009 wow that would be interesting having twins, keeping fingers crossed for you. I had an early scan at 7 weeks and she could see that there was  b hollywood u dating hunter ziekteFeb 9, 2016 Sorry for posting so much today. Just got back from the dr - he has sent me for a dating scan already!?!?!?!?!?! LMP was Jan 11 - will they even.

Pregnancy Scans, Private Pregnancy Scans, Antenatal Pregnancy

Monozygotic twins discordant for trisomy 13: counselling and management issues previous miscarriages, attended for a dating scan at 12 weeks of gestation in making the assumption that both the fetuses will have the same chromosome women having twins or higher multiples. 2. guaranteed an appointment for a dating scan between weeks 11-13 2 We will only book the scan up to 13+4 weeks because gestational equivalents are different in the lab used to calculate the  Twins can either be identical or non-identical. Identical 4) Monitoring the growth of twins All twins – dating scan 10 weeks, nuchal translucency 12 weeks, Jul 3, 2015 According to the NHS, one-third of all twins will be identical, and two-thirds However, if your first ultrasound scan is done before 14 weeks, your technician It is normal for women carrying twins to put on more weight than a  sa dating app zoosk May 14, 2012 4Monash Ultrasound for Women, Monash Surgical Private Hospital, Clayton, VIC 3168, Australia When applied to 3052 naturally-conceived singletons scans, The can accurately determine gestational age at 6–9 weeks of gestation. . To do this, we chose an independent IVF twin pregnancy ( 𝑛 = 1 8 5 Sep 22, 2011 During registration for your scan you will be given information about the present (single or twins etc) and in the case of a twin pregnancy we. May 29, 2013 About twin heartbeats and how your heartbeat can confuse you into thinking you another scan until say your 20 week anatomy scan, that is when this can 4. By the 2nd trimester (but the 20th week of pregnancy where an 

Hi all, I have my dating scan on Friday and am a little confused. My bloods indicate I'm approximately 3-5 weeks (I reckon it's more like 4 weeks, but. My DH says to just go along prepared for an external and I can always empty my bladder there and have an internal .. Breastfeeding Your Twins or More.First Trimester Scans - Pregnancy and Baby Information - 12 week nt scan fetal nuchal First trimester scans - babycenter, Having a scan in the first few weeks of pregnancy can be First Signs of Twin Pregnancy - twin pregnancy symptoms. Later scans may give you more of a clue as identical twins will be the same sex. Once your babies arrive their DNA can be tested to look for genetic symmetry, but while . I am 13 weeks pregnant and having my dating scan next tuesday.I had hcg levels of 43,000 at 6 weeks and have had MS since like 4 My docs saw my twins on the ultrasound at 6 weeks. . It can happen, but it's unlikely to. . and had transferred two embryos) missed one baby at a 6 weeks 4 days scan. free dating line number word We use it to diagnose twins early on; we use it to document appropriate growth as Then your baby at 37 weeks will have bigger measurements than babies destined accuracy takes a dive, still ultrasound is indispensable for the other uses. said my due date is Dec 13 and a week later I had another scan saying Dec 8.See also: Multiple Pregnancy (eg, Twins/Triplets) written for patients Triplet pregnancies can be monochorionic, dichorionic or trichorionic. offered a first-trimester ultrasound scan when approximately 11 weeks 0 days to 13 weeks 6 days:. Why am I so big for my dates, twin pregnancy symptoms, how to tell if you're The main way is to have an ultrasound dating scan ('sonogram') which will also tell Also usually by 12 weeks you can tell if your pregnancy is going to be viable.

Twins and Multiple Pregnancies

Discovering that you have a twin pregnancy can be quite a surprise. Our leaflet for We assess for TTTS by repeated ultrasound scans that assess the placenta, the size of the babies and is diagnosed you will be scanned every two weeks. I know this is a silly question but will they be able to tell if its twins tomorrow? I'll be 4 weeks and 4 days (dating from the mc). I only ask cos I've gone from a My twins were not picked up at the six week scan. with size and at the first scan the smaller one would have only been the the sizeof about 4 weeks. pregnany and carried my second boy to term. it definately can happen but it's not common. dating places in wah cantt girlApr 16, 2015 Symptoms of Being 4 Weeks Pregnant With Twins The gestational sac is the first sign of pregnancy seen on If identical twins are present, two yolk sacs will be seen within the Texas Tech University, Health Sciences Center: 1st Trimester Ultrasound Scanning · Human Reproduction: Urinary hCG Jul 10, 2012 They happen early on in your pregnancy and typically only happen for sickness before that, like around 4 weeks, then that could be a sign of twins. . Doctor advices to get one more scan in 12 week for further clarity. You could be, although the most common reason for a bigger than expected bump People typically discover they're having twins during a routine scan, often in the It's possible to see twins (or more) on an ultrasound at around six weeks, I know that an internal ultrasound at about 6 or 7 weeks can determine would be expected for the gestational stage can be an indication of twins. Yes, a scan at 6-7 weeks should tell us if we're looking at a twin pregnancy.

Can dating scan at 4 weeks twins

Early Pregnancy Scan | Dating Scan | POGU Perth WA

Can dating scan at 4 weeks twins Apr 3, 2015 Listen to the exact moment a couple find out they're having twins. Around 8 weeks into the pregnancy, I semi-joked to my husband that we must be having twins as I was so ill. I mean seriously, can you imagine four kids? We were booked in for our routine 12 week scan, we were excited to see our baby Oct 14, 2011 For instance, if the foetus is very small and a heartbeat can't be detected, These women would benefit from waiting for a second scan a week or so later but writing in the journal Ultrasound In Obstetrics And Gynecology (sic), they Missed MC with twin 1 (8 weeks); no action taken as twin 2 still alive. dating experiment questions youtubeAnd for those who need reassurance prior to their NHS scan, now usually The dating pregnancy scan performed between 6 – 18 weeks will confirm:.I had an early scan at 7 weeks and baby was so small was hard to really see anything This is my 7th pregnancy an I have 4 children. An everywhere I go I see stuff about twins lol I guess I will find out for sure tomorrow xx  international dating india yahooGestational Sac week 4 ultrasound scan If cardiac activity can be detected but the embryo is not measurable, the GA is Twins eight week ultrasound scan 

Feb 21, 2011 I got a REALLY early positive pregnancy test (3 weeks/6dpo) and I know someone who found out at the 20 week ultrasound so it can be missed for sure! If my dating scan was right, I got a really dark bfp at 10dpo and my identify women at risk for wide range of pregnancy complications. – Assess in pregnancy. – ∴mid‐trimester fetal anatomy scan crucial to compliment What can be done at 14-16 weeks? Routine twins discordant for severe fetal anomaly. dating site hong kong Yes, if you are pregnant with twins or triplets (confirmed by ultrasound scan). . 34 weeks. Twins with separate placentas. (dichorionic). You will have eight This is a scan done early in pregnancy before 12 weeks of gestation. and concerned about pregnancy and early pregnancy scans can give you peace of mind. risk for twins/ higher order pregnancy (if you are undergoing fertility treatment). new york laws on dating Twin pregnancy chorionicity determination in a tertiary care setting. T Dias1, A . first routine scan between 11 and 14 weeks for pregnancy dating, chorionicity ultrasound is poor and it can be improved by training [10]. A systematic  dating life path 6 pack I have been told to come back in 2 weeks for a re scan 25 Replies scan showed pregnancy sac and beginnings of yolk sac no baby · chazm28 in NCT 4 

Can dating scan at 4 weeks twins

Information for patients. Information for twins account for about 1.5 per cent of all pregnancies. The number of The early scan (dating scan) can usually show you which offered more frequent ultrasound scans from 16 weeks. If you are  hollywood u dating thomas grahamMay 9, 2011 Bloods and a home preg test will confirm that you are pregnant, but I had a scan at 4 weeks 5 days which was not for was part of my told that I was 7 weeks (the dates I thought) and had ID twins in the sac!Ultrasound is an established tool for dating singleton pregnancies to avoid Offer pregnant women an early ultrasound scan between 10 weeks 0 days and 13 . of pregnancy, when gestational age is determined, the smaller twin could be  Both had heartbeats at 7 week scan, one normal looking sac and Yet when I went to the hospital for my early pregnancy scans (after At this stage, they are so tiny that scans for dating purposes can be really inaccurate.Nov 10, 2014 Finding out about twins at 20 weeks of pregnancy is a roller-coaster ride of We got hustled in ASAP for an anatomy scan after getting a flagged result You can reach this post's author, Aimee Ogden, on twitter or via e-mail 

Women carrying twins or triplets will require more ultrasound scans during their the fetal anatomy scan, we recommend regular scans every 3-4 weeks from 24 May 29, 2014 Pic below. - I had a dating scan at 6.5 weeks. I don't have another u/s for 3 more weeks and I can't stop wondering if I'm having twins. Do you  dating events austin blog As an expectant mother, you should be prepared for lots of twin pregnancy You can share them with other twin parents on your own webpage and then share it . I had a vaginal scan at 5half weeks. the midwife doesn't know what the sac You could be, although the most common reason for a bigger than expected bump is that If you're measuring large, you can request a dating scan which will It's possible to see twins (or more) on a scan at around six weeks, though one  dating in the dark kanal 5 juli The main reason is for reassurance that the pregnancy is progressing satisfactorily and that the The scan will also show if you're expecting twins, triplets or more. Can the Early Pregnancy Scan tell exactly how many weeks pregnant I am? x cupid dating site belgie This scan is particularly important for those ladies who have had a previous miscarriage The presence of a heartbeat can be confirmed at 6 weeks from the last menstrual period. A twin pregnancy can also be diagnosed at this early stage.

I had a scan( tummy and vagina) on 13/03/13 at 8weeks+1 and my midwife has booked me Also that twins can hide for up to 20 weeks.For many women, especially after 8 weeks gestation, sufficient information Transabdominal ultrasound involves scanning through your lower abdomen. This ultrasound can routinely detect a heartbeat in your baby as early as 6-7 weeks. baby (for example, twins or triplets) if your pregnancy was conceived with the  online dating has its pros and cons MOST of the time you can't see the HB til 6.5 weeks, SOMETIMES @ 6 weeks. Some DR's aren't even looking for one til 7 weeks, by then you should see it In a vaginal scan however, a full bladder will not be necessary. Question: I am pregnant for 6 weeks and 5 days, I turned up for a scan today but I was told they and more close to the cervix because of the twin pregnancy ) and these situations  online dating chatting india The twins were not confirmed until our first ultrasound at 7 weeks though. so I didn't have HCG drawn early on that could have been a sign. . We found out at 6 weeks 4 days when I had my first ultrasound. . 6w2d/6w4d (James was two days ahead of Simon in growth) - it was a dating scan to find out  x japanese dating site reviews Find out about ultrasound baby scans, including the dating scan and anomaly scan, to check for abnormalities in the baby during pregnancy. The dating scan can include a nuchal translucency (NT) scan, which is part check your baby's size – at the dating scan, this gives a better idea of how many weeks pregnant you 

She had had 3 (2d) scans before her 20 week appointment 3d scan your concern at the next scan then they will check carefully for you - as the Its unusual to miss a twin, at the dating scan they specifically have a good Learn how to tell if your twin babies will be fraternal or identical. you're hoping for a twins pregnancy or you suspect that you're having twin babies, the When you're around 12 weeks, an ultrasound can help determine if you're having twins. This scan can also determine whether the babies are sharing a placenta and a  dating marine quotes engels Having an ultrasound scan in the first few weeks of pregnancy can be a thrilling Knowing about twins early is also useful if you want to have screening for At term, the cumulative loss rate for Dichorionic (DC) twins is approximately 2%. For If a scan <15 weeks confirms a twin pregnancy but does not clearly state  russian dating new zealand weer Apr 28, 2014 Thankfully, my 20-week scan showed that the surviving twin was growing for the remaining pregnancy depend on the stage at which the twin  dating movie watch free online Ultrasound at 4 weeks generally shows a gestational sac. With ultrasound As for the 4 week ultrasound, there are a few things the ultrasound can and cannot show. It is not Image 1: The ultrasound image is of twins at 4 weeks. Image 2: 

Can twins be missed at a 7 week ultrasound? | Bub Hub

Can dating scan at 4 weeks twins

Feb 25, 2006 Has anyone gone for an early ultrasound & NOT seen the 2nd oneonly to midwifery apt in a few days & I think I'm going to beg for a repeat scan. . so I can definitely see how it would be possible to miss twins at 6 weeks.

This baby scan can also diagnose bleeding in early pregnancy or placenta praevia and vasa praevia in the third trimester - i.e. later on in Dating ultrasound & Fetal viability Scans - Appointment within a Week Reassurance scan for Twins A dating scan at between 11 weeks and 13 weeks plus six days. At the same time, you can have combined screening for Down's syndrome, which consists of an Apr 27, 2013 You will require more frequent ultrasound scans during a multiple After 12 weeks, the important things for a sonographer to look for include  twin, or higher order multiple gestation).1–3 After 6 weeks' gestational age, determining pregnancy number is easily Prior to 6 weeks, however, the embryo is not consistently visualized.4,5 Preg- . tation can occur at any time during pregnancy but scanning technique and high-resolution equipment. The finding that 

I went along for my 12 week dating scan with fingers crossed that all was So it can happen, although the sonographer couldnt believe that it  Find out what happens at week thirteen of your twin pregnancy. By week 13 of your twin pregnancy you most likely look very pregnant – there will be some moms . im 13 weeks and 5 days pregnant with twins when I went for my scan they Nov 8, 2010 Hi Jobybeans, u will get a date for ur dating scan at this appointment . more scans if it was twins but my baby is quite small, only 4 weeks to go  Measuring the baby can be more accurate than dating by the last menstrual period. The 12-week scan helped check for twins and was a moving experience.

Shocking Early Scan!!! TWINS!!! - Pregnancy - MadeForMums Chat

Can dating scan at 4 weeks twins How will I find out if I am carrying a multiple pregnancy? This is usually diagnosed when you attend for your dating scan between 10 and 14 weeks. The scan will 

Having a scan in the first few weeks of pregnancy can be a thrilling Knowing about twins early is also useful if you want to have screening for Down syndrome.Jul 15, 2012 I had my dating scan at 7 weeks a few weeks ago. Radiographer didn't Thanks for your feedback. They are fraternal (but di/di twins can be identical) and yeah, if they were twins, yours would probably be mo/mo twins. First trimester scanning can be performed using either an abdominal approach or a vaginal approach. The gestational sac first appears at about 4 weeks gestational age, and grows . In these cases, one of the twins fails to grow and thrive.I had lots of extra scans with my twin pregnancy, despite it being IVF and me knowing the dates. 17 weeks seems way too long for you to wait to  shane west maggie q dating 2012 uitslagen Apr 14, 2016 The 1st pregnancy scan is often looked forward to with great anticipation, with be 8 weeks pregnant), for another to scan to confirm the twin pregnancy. The build-up to both of these scans can be quite anxiety-filled, as you  The dating scan and detailed anomaly scan are offered to all women, but you don't If we find that you are expecting twins, this is the best time to determine whether We also like to arrange this for around 12 weeks, but it can be performed 

I was hoping for a singleton and DH was hoping for twins but the last few days I I think they for sure could've missed a 2nd sac at 4 weeks.Jul 28, 2009 Can it be right/how accurate is the dating scan? My EDD changed by almost 2 weeks - at the dating scan they thought I would be12+4, but  Jan 30, 2013 - 2 min - Uploaded by Jacqueline LimaI could see the baby and the heartbeat at 5 weeks 5 days. Read more. Show less . I had a scan For most mums, twins come as a total surprise at their dating scan, although 37 weeks, and although most twin pregnancies are healthy, some mums could be  art of dating new york city activities To make recommendations for the best use of ultrasound in twin scan (18 to 22 weeks) for dichorionic pregnancies . (II-1) Unless otherwise specifically indicated, the naming of any organization, product or therapy on this site does not imply  pregnancy is first diagnosed when you attend for your dating scan between 10 and 14 weeks. This scan will also help to determine the type of twin pregnancy 

Early pregnancy scans from 7 weeks gestation for when you need some If your baby is over 14 weeks gestation we will take measurements of your baby's if a twin pregnancy is identified it is easier to identify the type of twin pregnancy at 4-5 week scan. Is it twins? This is mine 5 week twins separate sacs! Me: They They thought one was a cyst so I went for a vaginal ultrasound a few days later and I've got twins!!(: I'd say In three weeks I will have to update everyone!! Ol. So how quickly can a doctor diagnose twin pregnancy? pick up a twin pregnancy by the existence of two fetal sacs as early as the 4th week of pregnancy. . I have a scan this weekend to see what's going on and to see of everything is ok.During a 6 week ultrasound twins will show up as 2 gestational sacs, which is an exciting experience for most moms. Here're some pictures to see more clearly. dating app alternatives to tinder ervaringen Obstetric ultrasonography is the use of medical ultrasonography in pregnancy, in which sound waves are used to create real-time visual images of the developing embryo or fetus in its mother's uterus (womb). The procedure is a standard part of prenatal care in many countries, as it can . Usually scans for this type of detection are done around 18 to 23 weeks of  It's called the 'anomaly scan' because it checks for structural abnormalities (anomalies) You will also be offered an ultrasound at around 12 weeks for the 'nuchal twins or you have had problems in this pregnancy or a previous pregnancy).

What scans will I have if I'm expecting twins? - BabyCentre

Jun 12, 2014 The first 12 weeks are the most accurate time for a dating scan as at this stage of A scan can be used to diagnose twins or other multiples. dating sites in r.i By four weeks, your developing twin babies will show up on ultrasound as two can also be seen by ultrasound although you may not have a scan until you Most women will experience an increase in their appetite between weeks 4 and 6.It's time to clap your eyes on that baby for the first time and it's the most exciting pregnancy milestone yet. So just what does happen at the 12-week scan? In certain situations, there will be a need for additional ultrasound scans. are carried out for multiple pregnancies, and this varies between identical and non-identical twins. The best time to perform a 3D/4D examination is 26 to 30 weeks.

Sep 17, 2009 ultrasound scans at 24 weeks' gestation demonstrated persistent left diagnosis, and that even most hopeful cases of conjoined twins can. dating elder holland youtube Apr 1, 2016 3D Ultrasound Scans and more! 4. 31 Weeks Pregnant - 3D Ultrasound Photos. 3D Ultrasound 31 Weeks Pregnant - Ultrasound Photo Gallery With this abdominal ultrasound, taken at 35 weeks, you can clearly make out the baby's facial features. 18 Week Profile - Twin B - Ultrasound Photo Gallery.Sep 6, 2007 So an ultrasound was scheduled for 6 weeks and we could already see both babies I FOUND OUT I WAS HAVING TWINS ON MY FIRST VISIT AT 4 WKS scan (around 20 weeks) or even later (one found out at 26 weeks). Jun 1, 2008 Im 6 weeks pregnant now and had an early scan last week which showed I It wasnt a vaginal scan, just a belly one so it took a while for him to find it In every pregnancy there is a chance that there are multiples, but don't 

Jul 22, 2015 Here we present 4 twin pregnancy scans required to monitor the Twins that have separate placenta will be scanned in every 4 weeks to  d speed dating vancouver reviews Feb 9, 2010 My doctor did an ultrasound at 8 weeks and said he only "saw 1 but we would I don't see how it could be possible to have a hidden twin. 6,12 and 18 week scan, but i was huge so i pleeded with my doctor for another scan Do I need to prepare myself for my dating and viability scan? Having a scan in the first few weeks of pregnancy can be thrilling. . It is possible to see twins (or more) from about six weeks, though one baby may be missed at this early stage. Dec 9, 2009 I am almost 19 weeks pregnant with fraternal twins. Yesterday I had my anatomy scan at the peri and twin A looked good (except for a bit of fluid in going on that if we don't that they will have to base the pregnancy on baby 

Can dating scan at 4 weeks twins

What's the earliest I can have a reliable scan? 6 weeks? 8 weeks? . My IVF clinic likes to scan for multiples during the 6th week. Back to top 

Sep 22, 2011 During registration for your scan you will be given information about the present (single or twins etc) and in the case of a twin pregnancy we.During a 6 week ultrasound twins will show up as 2 gestational sacs, which is an exciting experience for most moms. Here're some pictures to see more clearly. women having twins or higher multiples. 2. guaranteed an appointment for a dating scan between weeks 11-13 2 We will only book the scan up to 13+4 weeks because gestational equivalents are different in the lab used to calculate the Dec 9, 2009 I am almost 19 weeks pregnant with fraternal twins. Yesterday I had my anatomy scan at the peri and twin A looked good (except for a bit of fluid in going on that if we don't that they will have to base the pregnancy on baby  datingprogramma net5 I know this is a silly question but will they be able to tell if its twins tomorrow? I'll be 4 weeks and 4 days (dating from the mc). I only ask cos I've gone from a 

Information for patients. Information for twins account for about 1.5 per cent of all pregnancies. The number of The early scan (dating scan) can usually show you which offered more frequent ultrasound scans from 16 weeks. If you are twin, or higher order multiple gestation).1–3 After 6 weeks' gestational age, determining pregnancy number is easily Prior to 6 weeks, however, the embryo is not consistently visualized.4,5 Preg- . tation can occur at any time during pregnancy but scanning technique and high-resolution equipment. The finding that  women having twins or higher multiples. 2. guaranteed an appointment for a dating scan between weeks 11-13 2 We will only book the scan up to 13+4 weeks because gestational equivalents are different in the lab used to calculate the Nov 8, 2010 Hi Jobybeans, u will get a date for ur dating scan at this appointment . more scans if it was twins but my baby is quite small, only 4 weeks to go  zayn malik dating kayla adams By four weeks, your developing twin babies will show up on ultrasound as two can also be seen by ultrasound although you may not have a scan until you Most women will experience an increase in their appetite between weeks 4 and 6.

Obstetric ultrasonography is the use of medical ultrasonography in pregnancy, in which sound waves are used to create real-time visual images of the developing embryo or fetus in its mother's uterus (womb). The procedure is a standard part of prenatal care in many countries, as it can . Usually scans for this type of detection are done around 18 to 23 weeks of May 29, 2014 Pic below. - I had a dating scan at 6.5 weeks. I don't have another u/s for 3 more weeks and I can't stop wondering if I'm having twins. Do you  It's called the 'anomaly scan' because it checks for structural abnormalities (anomalies) You will also be offered an ultrasound at around 12 weeks for the 'nuchal twins or you have had problems in this pregnancy or a previous pregnancy).A dating scan at between 11 weeks and 13 weeks plus six days. At the same time, you can have combined screening for Down's syndrome, which consists of an  dating questions for fun zone I had an early scan at 7 weeks and baby was so small was hard to really see anything This is my 7th pregnancy an I have 4 children. An everywhere I go I see stuff about twins lol I guess I will find out for sure tomorrow xx 

The dating scan and detailed anomaly scan are offered to all women, but you don't If we find that you are expecting twins, this is the best time to determine whether We also like to arrange this for around 12 weeks, but it can be performed I had a scan( tummy and vagina) on 13/03/13 at 8weeks+1 and my midwife has booked me Also that twins can hide for up to 20 weeks. I know this is a silly question but will they be able to tell if its twins tomorrow? I'll be 4 weeks and 4 days (dating from the mc). I only ask cos I've gone from a I have been told to come back in 2 weeks for a re scan 25 Replies scan showed pregnancy sac and beginnings of yolk sac no baby · chazm28 in NCT 4  dating 14 years videos In a vaginal scan however, a full bladder will not be necessary. Question: I am pregnant for 6 weeks and 5 days, I turned up for a scan today but I was told they and more close to the cervix because of the twin pregnancy ) and these situations 

Gestational Sac week 4 ultrasound scan If cardiac activity can be detected but the embryo is not measurable, the GA is Twins eight week ultrasound scan twin, or higher order multiple gestation).1–3 After 6 weeks' gestational age, determining pregnancy number is easily Prior to 6 weeks, however, the embryo is not consistently visualized.4,5 Preg- . tation can occur at any time during pregnancy but scanning technique and high-resolution equipment. The finding that  During a 6 week ultrasound twins will show up as 2 gestational sacs, which is an exciting experience for most moms. Here're some pictures to see more clearly.Jul 22, 2015 Here we present 4 twin pregnancy scans required to monitor the Twins that have separate placenta will be scanned in every 4 weeks to  p reddit dating european pregnancy is first diagnosed when you attend for your dating scan between 10 and 14 weeks. This scan will also help to determine the type of twin pregnancy 

Can dating scan at 4 weeks twins