It won't help, since the earliest ultrasounds are the best for this purpose. By the time you are at your 12th week, many doctors will say there is a margin for error of +/- 7 days if using an ultrasound to try to determine a due date.
I would explain the issue to the doctor and ask him or her to look through the ultrasound records from previously, and to determine whether the due date that was given to you was computed only from the baby's measurements and developmental markers from the ultrasound, or if it was given to you by measuring forward from your last period. The due date based ONLY on the ultrasound is the one that should be used, even if it disagrees with the one from your last period.
I'm really not sure. They measured around 8 weeks but said they would stick with the 9 week mark they set from me telling them the last period I had. Maybe they will tell me different when I go for the 2nd ultrasound?
You are saying you know that they did not give you the due date just from the information on your ultrasound, but they computed it instead by counting forward on a calendar or little wheel from the first day of your last period?
Hi, Jujub, how did you get the due date? The estimate of the conception date is only as accurate as the method that gave you the due date. Was it from an ultrasound? If so, how early in your pregnancy was that ultrasound?