Oh & I wondered if maybe the dates could be different because of this baby's weight. He weighed 1 lb 13 ozs at 21 wks. So bigger baby or just a lil farther along?! Lol My first was 8lbs 10ozs.
Im not sure bcus my u-s have always pretty much matched up with my lmp. Although usually ur first u-s in the very beginning is usually the most accurate. Both my kids went passed their due dates so who knows. I think its just up to when babies ready!
Babies grow at different rates so yours could just very well be measuring big...thus the earlier u/s due date. The general rule of thumb is the earlier the ultrasound, the more accurate the due date.
Once you are out of the first trimester - ultrasound measurements aren't nearly as accurate. If you had a first trimester ultrasound I would go with the date it gave you because it will more closely match up with your LMP.
Thanks ladies! My doc only does 1 u/s @ 20 weeks unless something is wrong with the baby/pregnancy so that's the only u/s i have to go by.