Changing due date !?

Question

Hello! So my original scan (8 weeks & 12week NT scan) I've been told that my due date is the 1st of Feb 17. That is also what the doctor has based it on from my last period. 
However when I went to my 20 week Morph scan, he said he was measuring the baby's due date as the 7th of Feb ( a week later ) and stated that the first scans generally aren't as accurate due to the fetal position I believe he said. So then my dr started basing my due date as the 7th instead of the 1st..

I went to my first antenatal appointment yesterday and the midwife advised they always go from the date of the original scan and the NT scan.

So I know it's only a week difference and baby could come earlier or later to what they say anyway, but just after some thoughts if this has happened to anyone else and what date would you base it on!?

Many thanks 😊

Answer

The early ultrasounds are more accurate because in the beginning babies all grow at pretty much the same pace but once you get further along babies start to grow differently -you could go for another scan and find out your baby is back to measuring with thebesrlier due date
I've never heard of a doc changing the due date that late and for only a difference of a week..

Answer

I'm pregnant they IVF and even though we knew the date of conception they still have given us a wide range of due dates. They give your due date based on average baby sizes at a certain range. And supposedly "all" babies are the same size in the first few weeks. It's all a guesstimate!

Answer

8 years ago my first scan and based on my last menstual period I was told I was due beginning  of April but then I had a blood work and another ultrasound a month later and it showed I was a whole month off, I was actually due May 4th so my daughter came May 3rd. They told me that I  didn't ovulate when I tought I did.

Changing due date !?

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