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First Trimester of Pregnancy Question

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DoctorQuestion
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Joined: 19 Dec 2005
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First Trimester of Pregnancy Question
Posted: 12-28-05 11:23am

Ok, Im pregnant, missed period and three positive tests. Cycle always normal 28days.
My husband and I had sex the week of Thanksgiving and on Nov. 27 I started my period, i thought it was pretty normal.
On Dec. 9th-12th I was supposed to ovulate.
We had sex on Thurs the 9th morning
Friday the 10th early evening
Sat the 11th late evening
On Friday the 10th around noon, i used an ovulation stick, and a very faint line appeared saying that i was getting close or finishing ovulating.
On Sat. evening, i used another stick and no line showed up at all.

Now, today is Dec. 28th, and I was just wondering so I used a ovulation stick again and two lines quickly appeared saying that I am ovulating. Whats going on, and do you know when I might have conceived?
HELP
Thank you soo
much


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DoctorAnswer
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First Trimester of Pregnancy Answer A39
Posted: 12-29-05 17:57pm

Ovulation stick-tests rely on detecting Luteinizing hormones (LH). LH levels rapidly increases just before ovulation occurs, thus a positive test around noon on the 10th. LH levels then rapidly decrease during ovulation, thus a negative test on the evening of 11th.This means that ovulation probably occurred somewhere between the 10th and 11th and, most likely, you conceived during that period.

Further, when a woman is pregnant, an ovulation stick test is positive because the test detects, not LH, but hCG (human Choriongonadotrpin). hCG is produced by the embryo. LH and hCG have very similar structures and ovulation stick-tests are not so specific as to recognize the difference between them.


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