A member asked:

My original due date was dec 2nd then it went too nov 29th then to nov 20th is my conception date and period still the same even tho they changed my due date because of how the baby measures ?

A doctor has provided 1 answer

The dates change: The early estimate of due date based on last menses is a bit undependable. When they have an ultrasound or other more accurate measure later in pregnancy dates shift. The simple rule on expected conception date is one year back from due date plus 12 weeks. If the due date shifts the conception date does too.

Answered 10/2/2012

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