Early ultrasound dating off

I had my anatomy ultrasound at 19w2d and I was measuring exactly that at that ultrasound. It doesn't just happen right away, it can take a week and then to make the journey takes some more time. A fetus might just be short at this time, so it will be measuring short. Just like every pregnancy is different, so is every baby and how it grows in and out of belly. I’ve also been feeling flutters since 9w4d, but this is my 4th pregnancy.

My uterus is also protruding out, she actually cupped it with both her hands during the exam and was quite surprised at how big it was. So I kind of chalked it up to that (measuring big, feeling flutters and also found the heartbeat on a fetal doppler at home at 8 weeks and was surprised I found it so early) but it was surprising how developed the baby looked at the vanity ultrasound.

My uterus is also protruding out, she actually cupped it with both her hands during the exam and was quite surprised at how big it was. I had a viability ultrasound at 6w3d and my OB said the same thing.

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This is the period of time which provides the most accurate assessment.

Generally, ultrasounds which are performed in the first trimester are within 3-5 days of being accurate in terms of assessing gestational age.

My last birth was in 2008 so I would think my body had LOTS of time to get back to normal.

I have two children and My third pregnancy ended in m/c earlier this year (13 weeks ..baby’s heart stopped at 12 weeks) I hadn’t been having regular periods since and that is why I needed the dating ultrasound.

Other reasons to have a 7 week ultrasound are to: The embryo will be measured from the top of its head, the “crown” to its bottom or “rump”.

This is because it is the longest portion of the embryo’s body and provides an ideal measurement baseline of growth and development.

This is why an early pregnancy dating scan, rather than one done in the later stages of pregnancy, is considered more accurate when assessing the expected date of delivery.

With maturity, the size of the baby correlates less to its age than in the early weeks.

The limbs and the yolk sac, though obviously important, are not the primary means of measuring growth.

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