How far along?: What was the estimated gestational age when you had the ultrasound? If your first sono was late second trimester then a 9 or 10 day discrepancy could easily just reflect a fetus slightly smaller than average. Sex on the 9th could easily result in conception on the 13th or 14th. A latter sono could easily be off by 10 days. Lots of room for uncertainty!
Answered 6/11/2013
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