Can a dating scan be wrong by 4 weeks

Every pregnant woman wants to know her due date , and a due date that is calculated from her last menstrual period with a due date calculator often doesn't match the due date that is estimated by her first ultrasound also known as a sonogram. During an ultrasound, a technician will spread a warm gel over the lower part of your abdomen and then press a tool called a transducer against your belly to examine your fetus using sound waves. An image of your fetus will appear on an accompanying computer screen and while looking at this image, the technician will take some standard measurements from different angles and listen for a heartbeat. Don't worry: This type of exam is painless and risk-free, and seeing your baby for the first time will likely be an enjoyable experience.

Your pregnancy and baby guide

When I first found out I was pregnant I worked out my own dates and then went doctor. The doctor confirmed I was pregnant and also the rough date is come up with which was around 4th FEB. I was then very sick and suffered with hyperemisis and was admitted to hospital where they did an early scan which suggested I was only 8 weeks and my EDD was 2nd March.

Which St the time threw me a little but I went with it. I've had a few scans since and it's still matched up however I have been continuing with suffering with hyperemisis. I went to my midwife last week and she said I was measuring small so ordered me a growth scan this didn't Suprise me at all as I have got a small bump and I also had growth scans with my little boy. I went for my growth scan yesterday, I'm basically 33 weeks. Every single one! They then said the current EFW is 5lb 13oz!!!!

I nearly fell off the bed!! Which also puts me at 37 weeks. I questioned the consultant if my dates could be wrong and all I got was "possibly" or just a big baby. What do you all think? I can't stop running it through my mind. Guess I just need to get prepared now! The earliest ultrasound is usually the most accurate for dating and around 8 weeks would usually be a pretty reliable bet.

There is only one possible date that Dh and I conceived. No way this one could be any earlier. I didn't have a dating ultrasound because I'm positive I know exactly when it happened. He's been measuring ahead the entire pregnancy. First it was just a couple of days, then nearly a week, and next week we are checking again because my fundal height is suddenly 4 weeks ahead.

After a certain point, they start growing at different rates. It doesn't change gestation and fetal weight measured via ultrasound is notoriously inaccurate sometimes by as much as 2 pounds so I definitely wouldn't put too much stock in that. Hardly slept because been over thinking everything. I guess I'll just get my hospital bag sorted and ready and the moan things and see what happens. Just a big baby. All my babies were born 10 lbs at 39 weeks exactly with no GD and my growth scans at 34 weeks would always say 41 weeks.

Some people just make super healthy babies. You due date is the one the 8 week ultrasound said. It could be that you have a very big, stretchy uterus. That is how mine is. My doctor knows this from my 1st pregnancy, and it is happening again with this one. My fundal height is measuring around weeks even though I'm almost 32 weeks. My first son was not large for his gestational age, and I doubt this one will be, either.

Maybe that's what's going on with you? It's much more likely that you are having a big baby than that the date is wrong. Late ultrasounds can be very off and the difference between a 8 weeks baby and a 12 week baby are huge and should have been quite obvious on ultrasound. The first ultrasound is the most reliable which should be around weeks. The ultrasound measurements can be way off I'm telling you from experience.

Let's also remember that weight and maturity of baby do not go hand in hand. The later ultrasounds are less likely to be accurate than the 8 week. The fluid cld be high or low and they estimate the weight adding up measurements as they are unable to see the full baby on screen at once. The sizing scans can be so wrong too, i know so many people who have been told they are having massive babies who come out tiny or average! I was induced a week early due to sizing scan, they were saying my baby was measuring off the charts past 42 weeks when I was only 38 they were even suggesting c-section which I refused!

He was born naturally with no complications after only 4. So take everything they say with a grain of salt, those scans are notoriously wrong. Thank you so much guys! You've calmed me way more than anyone and it's nice to know some of you have experienced same thing: I'm at the midwife today so hopefully everything good and I can just focus on my healthy baby: What ended up being the weight of your baby?

Both hubs and I come from a family of 7. My first baby was averGe. Sometimes, your due date for baby's arrival may change - even after you've shared it with all your family and friends. Here's why your doctor may change your due date. What's wrong with me? I measured 34 weeks and im only 32 weeks does this mean ny due date is wrong or is he just a big baby? Anyone else been told this before? What was your B by Bkhr1.

March Babies. Bookmark Discussion. I went to my midwife last week and she said I was measuring small so ordered me a growth scan this didn't Suprise me at all as I have got a small bump and I also had growth scans with my little boy I went for my growth scan yesterday, I'm basically 33 weeks. My little boy was born 6lb 3oz he's now 3. Could it be that my due date is infact around 4th feb? Reply Close. Sort by: Oldest Newest 12 Posts. S Sparkle A Arps In May Babies wrong due date or big baby?

In December Babies Was my baby early or were the dates wrong?? Jump to Your Week of Pregnancy. WTE Must Reads. Pregnancy Week by Week.

“Then at my 12 week scan, they put me forward by 4 days.” “If the scan date differs from your LMP dates, then the scan dates will be used, but do discuss with . I had a dating scan today thinking I was almost 8 weeks. I could have ovulated later and I know they didn't really measure the baby but I'm a mess. . I went today for my dating scan thinking that i was 7wk1day however they I knew the doctors were wrong about the dates from the start but I kept quiet.

A dating scan is an ultrasound scan to determine how many weeks pregnant you are and your due date. Read on for more information about what a dating scan offers. A dating scan might be recommended to confirm your due date if you are unsure of your last menstrual period or your date of conception. It is usually offered to pregnant women from 10 weeks to 13 weeks gestation, but can be carried out any time from 6 weeks.

The first trimester begins on the first day of your last period and lasts until the end of week This means that by the time you know for sure you're pregnant, you might already be five or six weeks pregnant!

Menu Close menu. Back to Your pregnancy and baby guide. Some women's cycles are not exactly 28 days.

Find out your due date with our calculator

Read our full data protection and privacy policy for further information. You are free to change your mind at any time. If your cycle is shorter or longer than 28 days, please adjust the number above. You will then receive your estimated due date and the option to sign-up to our pregnancy email. This weekly email gives you fun pregnancy facts, useful tips and great recipe ideas to help you and your baby have the healthiest possible pregnancy.

can a scan give you the wrong dates

We love marking big dates on our calendar. Impending life changing dates such as the arrival of a tiny human from womb to world? Please, dear god, give me a date for that! I am not alone. So, are we just really bad at predicting when babies come? Or do babies just play by their own rules? Probably a little of both. A study looking at nearly 20, births comparing these traditional methods found that precise prediction simply does not exist. Regardless of which method was used to determine estimated Date of Birth , the actual Date of Birth showed considerable variation between babies up to 2 weeks before, and 2 weeks after.

When I first found out I was pregnant I worked out my own dates and then went doctor. The doctor confirmed I was pregnant and also the rough date is come up with which was around 4th FEB.

We use cookies to allow us and selected partners to improve your experience and our advertising. By continuing to browse you consent to our use of cookies. You can understand more and change your cookies preferences here.

First trimester: weeks 1 to 12

Babies can measure ahead. Dates for baby is more accurate at early ultrasounds. I'm not sure tho that a baby measures 2 weeks ahead tho. Mine is often 4 days ahead of my due date the gave me at my dating scan at 6 weeks. There can be some variances in due date vs when you had intercourse but a 2 week difference is a lot. Maybe you ovulate early and baby is big? Its hard to tell with out a 1st tri scan to compare. You add two weeks before you were actually pregnant. That's why they go off your last period because most people ovulate about 14 days after CD1. I think the issue is how you're counting, you wouldn't count from when you had sex but at least 2 weeks before that. It's unlikely the ultrasound would be wrong by 2 weeks. The start of your pregnancy begin the first day of your last missed period.

Latest Stories

MFM mums share their stories plus expert sonographers explain why it happens and what to do if you're told your due dates are wrong. By Rachel Mostyn. Original date given was 18 December but at the scan it was moved to 31 Dec. Unless you have an early pregnancy scan most of you will be given your estimated due date at the week scan. Of course you have probably already used an online due date calculator.

Ultrasound Accuracy for Predicting Due Dates

A dating scan is an ultrasound examination which is performed in order to establish the gestational age of the pregnancy. Most dating scans are done with a trans-abdominal transducer and a fullish bladder. If the pregnancy is very early the gestation sac and fetus will not be big enough to see, so the transvaginal approach will give better pictures. Dating scans are usually recommended if there is doubt about the validity of the last menstrual period. By 6 to 7 weeks gestation the fetus is clearly seen on trans-vaginal ultrasound and the heart beat can be seen at this early stage 90 to beats per minute under 6 to 7 weeks, then to beats per minute as the baby matures.

Yup. Your Due Date Is Wrong.

Please confirm that you are a healthcare professional or researcher. I am interested in Ava for personal use. How many weeks pregnant am I? This might seem like a straightforward question to ask your doctor, but due date calculation is often inaccurate. Past your due date?

Big baby/dates wrong??

So just what does happen at the week scan? Your week scan can take place any time between 11 and 13 weeks. So you can see all his organs, muscles, limbs and bones are in place, and the sex organs are well developed too. The week scan is usually just about determining whether your baby is healthy and growing as it should be. Although the sex organs are well developed, it's usually too soon to see them at 12 weeks. Some people believe in nub theory , which suggests you can determine the gender of your baby from that first ultrasound photo.

We value your feedback

.

How often during an ultrasound is the said gender of a baby incorrect?
Related publications