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Home pregnancy test showed positive. How to find the conceiving periods?

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Practicing since : 1983
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My girlfriend has a question , XXXXXXX 15th @ 2am, we went to the hospital for a cough that lasted a couple weeks ( unrelated ). Although they did a pregnancy test at the hospital which came up negative on the 15th of XXXXXXX she took a home pregnancy test July 2nd and that is positive we are curious to as when the baby has been conceived?

Dates and Times Of Events Are Below.
May 26th she got her period. XXXXXXX 15th @ 0200 - she went to the hospital with a negative pregnancy urine test
July 2nd @ 1945 - took a home pregnancy test and it was positive
July 3rd @ 3pm - was confirmed pregnancy at planned parenthood

So, If she was negative on XXXXXXX 15th then she would have to have conceived XXXXXXX 1st at the Earliest correct?
Posted Tue, 24 Jul 2012 in Pregnancy
Answered by Dr. Minoo Bhagia 1 hour later

Thanks for writing to us

Pregnancy test in urine takes at least 14 days to show positive results so she might have conceived in the middle of the XXXXXXX

Sometimes the results are doubtful or false negative or positive so you can not say 100% accurate date.

If the cycles are irregular then one can get late results.

HCG levels in the blood come positive within 11 days.

Any further query is most welcome

Best wishes

Take care
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