Can a dating scan be wrong by 3 weeks

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Otherwise we will have to keep prompting you with this message. What do you say? June 28, at 8: June 29, at June 29, at 1: June 29, at 8: July 13, at I hope everything goes well for you. July 14, at 3: Hi ladies, I am 22weeks going by my first doctors appointment and due November 17th. The information contained on eumom.

Dating scan accuracy?! | TES Community

If in doubt, always consult your doctor. Enter your email address to get started!

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Close Cookie Acceptance In order for our site to work properly and constantly evaluate and improve your experience we need to store small files called cookies on your computer. This is where you discover that your due date isn't based on the date you conceived, it's actually calculated from when your last menstrual period started your LMP. It's because it gives a definite date for health professionals to work with.

There would be so many variables if it was calculated from when you think you conceived, especially as everyone's cycles are different and the fact that you don't necessarily conceive on the day you have sex! But this will only give you a rough idea.

3 reasons why your due date is wrong

This is especially true if you have an irregular cycle or have been on the Pill for example. Experts say that the scan date can sometimes come out as less pregnant than suggested by your LMP.

How accurate is ultrasound in dating a pregnancy?-Dr. Nupur Sood

But then again with my first baby I was spot on with dates, he always measured big and he was a week overdue Babies are ready when they're ready - try not to worry easier said than done. But Nigel also says that the estimated and that is all it is date is normally accurate plus or minus about a week. The healthcare professionals will stick to this date as far as possible because it is then used as the baseline for growth throughout pregnancy.

Your baby's growth can slow down and then have spurts. I've not even had my 20 week scan yet.

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I have scans every few weeks so it will probably keep on changing. My baby will come when it's ready anyway, maybe weeks before or maybe weeks after my due date. These can be carried out from week 5 or 6 of pregnancy, which is a notoriously tricky time to be accurate on dates.

What can I do?

Measurements at such an early stage aren't accurate which is why they wait for 12 weeks to date you. Expert Jan Steward, who is director of Ultrasound Direct and Babybond, agrees that early scans carry a much greater risk of inaccuracy. We always recommend mums get a definitive dating scan closer to 12 weeks as this will be much more accurate. Just half a millimetre at such an early stage can change your date by a week.

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  • Can your pregnancy scan give the wrong due date?.
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  • When and Why Your Doctor May Change Your Due Date.

Your week scan will be far more accurate. The sonographer then said that I was only about 4.

Then at the week scan I got an EDD of 15 march, so that early scan was completely out. Well, you'd think so, wouldn't you. At around 12 weeks you can get more accurate measurements. By talking to the health care professionals you should get a clearer picture as to what is happening. Thanks so much for your post — we always welcome feedback, positive or negative, as we always aim to make our articles as accurate and as helpful as possible.

We spent a lot of time talking to sonographers before writing this article, so we're surprised that you think what they're saying is not in line with what you have studied.