A member asked:

When using the online calc to get conception date...are those to the day if you knew your lmp and ultrasound dates match. how off can they be?

A doctor has provided 1 answer
Dr. Gerard Honore answered

Specializes in Fertility Medicine

It depends : On how regular your cycles are. If regular then it could be +/- 2-3 days; if irregular it can be way off.

Answered 3/13/2014

4.4k views

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