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When Did I Conceive?

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mrc0208

New User, Becoming EHEALTHy
Joined: 26 Jul 2007
Posts: 1
When Did I Conceive?
Posted: 07-26-07 14:16pm

My last regular period was April 6th through April 12th. I had an irregular period at the beginning of May but my cycles were off for a few months and I can't determine what the exact date was. My husband and I had been having unprotected sex for 2 1/2 years and couldn't get pregnant. On May 29th I made a huge mistake and had sex with someone else. I did use protection the only problem is...I found out 8 days later I was pregnant. The following day, which was June 7th, I had an ultrasound and they measured me 5 weeks and 0 days. On June 21st I was measured 7 weeks and 0 days then I began bleeding so I had another ultrasound 4 days later and measured 7 weeks and 4 days. All of my ultrasounds measure to the day every time but my Doctor says I conceived between May 13th and May 21st but my due date is February 8th and that would only be a 38 week pregnancy if she is right. I also researched the brand of home pregnancy test I took and it says I could test positive as little as 8 days after conception. I can't help but to worry that this is not my husband's child. Someone please help me and give me some guidance because I know this stress is not good for my child. Also, my husband is aware of this and I have discussed having an amnio to determine parternity with my doctor but she will not order the amnio for me because she says it is not a legitimate reason. I just can't wait for this child to be born to know who he or she belongs to...I need to know now.
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Kia

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Joined: 23 Jun 2004
Posts: 6594
Location: Planet Tampaxia,

Posted: 08-07-07 05:57am

9 days after your "fling" you measured as 5 weeks exactly.
9 + 14 = 23 days (+14 because of adding 2 weeks from date of conception)
5 * 7 = 35 days
= no chance of this pregnancy being a result of your fling.

A pregnancy is indeed 38 weeks from the date of conception. However because most people know the date of their period and not the date of conception doctors add those 2 weeks on and count from an average 28 day cycle.

My educated guesstimate is that you conceived around May 18 - meaning sex in the 5 days prior to and including May is most probable to have resulted in this pregnancy.
This means you were already pregnant when you had your "fling".
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