On week two!: It's a crazy system, but the forty weeks of pregnancy are counted from the first day of the last period. And that's counting on that perfect 28 day cycle! this means that you are really pregnant for 38 wks, not forty. So count back to week two - that's when you likely conceived. You have probably had an ultrasound by now which can firm up your dates reasonably well. Lgromkomd.
Answered 11/28/2017
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