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ardeur 09-11-2012 02:45 PM

Start of pregnancy
Scientifically, do we consider fertilization or implantation the actual start of pregnancy?

Tina5834 09-11-2012 02:58 PM

I consider it at implantation. If that egg got fertilized but, for some reason, never implanted I wouldn't consider myself pregnant.

ardeur 09-11-2012 03:02 PM

Re: Start of pregnancy
So should your 40 weeks start at implantation?

Kirsie 09-11-2012 03:12 PM

Re: Start of pregnancy
Pregnancy dating (day 1 of your 40 weeks) begins at the start of your last menstrual period.

Tina5834 09-11-2012 03:27 PM


Originally Posted by ardeur
So should your 40 weeks start at implantation?

No, you would just be pregnant for 38 weeks on average.

happysmileylady 09-11-2012 03:38 PM

Re: Start of pregnancy
That just depends on who you ask, and the purpose behind the question. It's really still a matter of opinion.

Kap7270 09-11-2012 06:22 PM

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.

JeDeeLenae 09-11-2012 06:24 PM

Re: Start of pregnancy
I also think it depends on your reasoning for that question. I don't consider myself pregnant until implantation has occurred. I am not pregnant on Day 1 of my cycle/period, but understand why it is counted when dating a pregnancy. It's much easier to date the first day of your last period than it is to date your conception, ovulation, or implantation. KWIM?

KelseyH 09-11-2012 06:27 PM

IMHO, pregnancy starts when the sperm meets the egg.

newmommy13 09-11-2012 06:40 PM

Conception happens a lot more frequently than anyone knows but implantation is what makes a pregnancy.

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