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I had an ultrasound a few weeks ago (to date the pregnancy as I didn't know when my lmp was) and I was measuring 8w5d. I had my first OB appt today and he did a scan to double check and I was 10w6d (should have been 10w5d) so a day ahead. My due date isn't moving as he even said the first is the most accurate.
My EDD moved from 12/10 (LMP) to 12/11 based upon the ultrasound scan. That's not a huge difference, but I'm not surprised as I know precisely when I ovulated. I think if you know your actual ovulation time - you can pinpoint your EDD with some fairly good accuracy right off of the bat. Ultimately, it's just up to baby as to when he/she wants to come - so I guess we can't get too wrapped up in those dates anyway.
Maggie - Proud Mommy to Marlowe & Willamina
The baby's growth can vary in those first few weeks so I wouldn't worry too much about a matter of a few days. My first child was due on 10/11 by LMP / ovulation, an early u/s changed the due date to 10/5 and he didn't come until 10/21 (and he had to be evicted!)
I agree with Butterbear, the baby's growth varies SO much during the first tri that it's really hard to pin point by ultrasound. All my babies measured behind between 7 and 8 weeks and ahead either before or after. My first born which was from an IVF cycle was 5 days behind at 8 weeks and we knew (to the hour!) how old he was. Once we got into the second trimester, he began to measure 2 weeks ahead. He was all over the place in growth and was born at 39.4 weeks healthy.
My second born was 6 days behind at 7 1/2 weeks, but measured ahead at 6 weeks and at 10 weeks. She was born 13 days over her due date and had to be evicted.
This little one was 5 days behind at 7 1/2 weeks but ahead at 10. Because I knew the ovulation date and because of my history of that lag time, we used that.
I guess the only way to really know your due date with complete accuracy is if you know the day that you ovulated.
For my daughter, my due date by LMP was June 1. My first u/s (~6w) gave me a due date of May 27. 3 weeks later another u/s put me at May 28, and I think another one around 12w put me at May 26. They never changed my official due date from June 1, but I always considered it May 27. They said they wouldn't change it unless it was more than a week different. I measured ahead the whole pregnancy, but my DD had to be "kicked out" (induced a week after my official due date).
My due date changed 3 times from what I was guessing when I first found out. I thought 12/20 then to my Dr's guess based on my quants of 12/21, then first US moved it to 12/19 based on gestational sac size. Then my 6 week US moved it to its official date of 12/18.
Then at my 8 week US baby was measuring 2 days ahead but we arent changing the date anymore.
Thank you *JMC1988* for the perfect siggy