Baby change a lot in those early weeks so it is easier to tell the date.
how accurate is a dating scan?
I doubt they would change your due date based on a later ultrasound. The further along you get, the more variance in size of the baby compared to others at the same stage of pregnancy. Usually the early ultrasounds are pretty accurate. I went in for my first ultrasound when I was 9 weeks and they estimated me at 9 weeks and 5 days cause of what the baby was measuring.
When I went in for my 2nd ultrasound at 17 weeks, the doctors told me again that the baby was measuring about 6 days ahead of what week I was actually currently in. But I know for a fact that my DB was the same way and measured bigger gestational wise than what he was supposed to be. My doctor told me that the baby has to measure 10 days ahead of what the baby is supposed to be measuring gestational wise at the time based on your LMP in order for them to change the EDD. I asked my dr at my last appt if my edd would change if baby measured big or small at my us next month.
She said an early us is much more accurate than a 20 wk us, more accurate than lmp.
I was told I was 8 weeks.. I will know soon how far a long I am. I'm guessing 17 weeks. I went to the health dept and they said I got pregnant in Dec and I know that was not possible because I wasn't feeling the symptoms until at least mid Feb. I guess its just one of those things that you just know. But then my boyfriend was a huge baby hes 6'4'' now so i could have a huge baby. I am worried about the HUGE baby too, he is 6' Most drs wont change a due date after 20wks if the baby measures bigger, they will just say your having a big baby.
I'd say the earlier ones probably are a little more accurate. The one I had a few weeks later was still only days earlier. I had one a little over a week ago that put our baby as being 6 days earlier than the original EDD. I wouldn't be surprised if we go in next week and are told that we're a tad earlier still. DH and I are both fairly tall and if genetics reallys starts kicking in later on, our baby could just be "taller" than average without being "older.
The earlier the US the more accurate it is. But the anatomy scan it could show something different since babies grow at different rates but you should still go by the 1st ones date.
How accurate is the Estimated Due Date by ultrasound?
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How accurate is an early ultrasound for dating? - Mothering Forums
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