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Just half a millimetre at such an early stage can change your date by a week. 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.
Ultrasound in early pregnancy (before 12 weeks) – Dating Scan more reliable than one done in the second half measurement is not absolutely accurate. 3 days ago Sometimes the due dates estimated by an early ultrasound don't match the expected due date based on the last menstrual period. Learn why.
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. We'd be really keen to know more about your studies — and what you have learned. You're right that we did include 'anecdotal stories' in our article.
We used them to illustrate the key points we were making in the articles but the quotes we used were all centred on the real experiences of pregnant women posting in our forum. We are confident that we are not using these quotes to 'misinform women', as the key points in our article were all sourced from expert monographers. It's interesting that you say that ultrasounds between 8 and 10 weeks are the most accurate.
In the UK, most pregnant women don't have an ultrasound until they are at least 12 weeks pregnant. Perhaps you are based in the US, or another country, where ultrasound practice is a bit different?
Now at 31 weeks he's ahead a little. Good luck with your decision mama! My MW had me have an early ultrasound with my last baby even if I knew when my missed period was. That ultrasound was 5 days off. With my first at both my early ultrasounds the dates were within a day.
This time around I had an early ultrasound at 8 weeks because I didn't even get my period back since my last baby. I seem to remember reading that 8 week ultrasound are most accurate, to within a day or two even if you know when your last period was, that doesn't guarantee an accurate due date since dates of ovulation can vary quite a bit. The longer you wait the less accurate an ultrasound is for dates.
At 20 weeks they can be off by at least a week. I had one at 7.
I think I read that the earlier ultrasounds are more accurate for predicting due dates then the third thrimester ones based on size. But, the baby will come out either way - whether its December or January - if you aren't a planner it might be fun to wait and see.