PREGNANCY-BIRTH Messages for November, 2001: Re: Curious about Conception Date versus U/S

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Re: Curious about Conception Date versus U/S
From: R. Daniel Braun, MD (anonymous@obgyn.net)
Thu, 29 Nov 2001 20:43:07 -0600 (CST)

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At Thu, 29 Nov 2001, anonymous wrote: >
>O.k., here are the facts: LMP - Started late evening Oct. 3
> Unprotected sex Oct. 13, 14, 21 & 22
> Sex using (early) withdrawal Oct. 18 & 20
> Took HPT Nov. 3 - negative
> Took HPT Nov. 6 - positive
> Had U/S Nov. 26, they dated 7.4 weeks
> The intake nurse used a dial and told me
> Oct.18 was our most probable conception date.
> She said the early U/S almost guarantees it!
> I'm skeptical...what do you experts think?
> Thanks for indulging me, I'm very curious
> about our conception date. This a great site!

If you are 7.4 weeks (Plus or minus 5 days)[that is all the more accurate US is at this stage.], then conception (Egg meets sperm in the fallopian tube) occurred 5.4 (Plus or minus 5 days) weeks ago. Whatever date that was. The episode of intercourse that deposited the LUCKY sperm could have been as much as 5-7 days prior to that or as little as 6 hours prior to that. So which day was it ????

-- R. Daniel Braun, MD FACOG FOG
This is for educational purposes only, and is not intended to be replacement or substitute for consultation and examination by an appropriate medical professional. Due to time constraints, private e-mails cannot be answered.

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