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Old 09-11-2012, 05:22 PM   #7
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Join Date: Jun 2012
Location: Alabama
Posts: 302
Re: Start of pregnancy

When they calculate fetal age (which is 38 weeks average), they do it based on conception.

My understanding is that the original OBGYN definition of pregnancy started at conception, and it was changed to implantation so that things like the pill were not considered abortion-inducing. So, yes, there are a whole bunch of moral and political implications based on how you answer that question.
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