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Old 03-29-2006, 01:23 PM   #1
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PrasannaS HB User
Counting Pregnancy weeks

This may seem like an obvious question. However, I am not able to tell how many weeks pregnant am I. My last AF was on 2/21 and I was due on 3/21. I am a week late and got a postive HPT. Am I 5 weeks already now? When does the clock start? From your last AF or from the time you ovulated?

Your inputs will be much appreciated. Thanks!

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Old 03-29-2006, 01:47 PM   #2
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*Stace* HB User
Re: Counting Pregnancy weeks

They start counting the 40 weeks from the first day of your last period. The baby's gestational age is actually about two weeks behind that, from when ovulation occurs, but your body starts preparing for a potential pregnancy when your period starts.


Old 03-29-2006, 03:08 PM   #3
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Re: Counting Pregnancy weeks

Thanks Stace

Old 03-29-2006, 06:01 PM   #4
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Re: Counting Pregnancy weeks

I got my last period on 2/21 as well, but I O'd on CD18 (March 10).

I am technically 4 weeks + 5 days, which means that I am in the fifth week. The fetus age is 3 weeks. (You are 5 weeks + 1 day, fetus 3 weeks assuming you O'd on CD14).

Since most people don't know exactly when they O'd, doctors go back to the last menstral period to start the calculations.

40 weeks from LMP.
38 weeks from conception.

Just figure out how your doctor describes it and use that convention. Most of the books I've seen list both side by side.

Last edited by xinerevelle; 03-29-2006 at 06:05 PM.

Old 03-29-2006, 06:20 PM   #5
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Re: Counting Pregnancy weeks

Thanks everyone for yoiur inputs

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