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A member asked:
Why is pregnancy based off your last period?
A doctor has provided 1 answer
Reliable!: Because most women know more reliably when their last period started than when they actually conceived. Many women who are 'certain' of when they conceive are more likely to get the last period accurately. Doctors still use LMP dating even for exactly known conceptions (iui, ivf) so everyone speaks the same language.
Answered 2/13/2015
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