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how soon can a test read positive?

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What is the absolute minimum number of days you can receive a positive pregnancy test after conception?

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replied June 22nd, 2011
Pregnancy Answer A24300
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Blood/serum HCG level estimation is accurate (it can detect pregnancy earlier at about 11 days post conception), than a urine pregnancy test (which usually start showing positive results after about 20 days post conception or even later). The HCG levels will also suggest approximate gestational age (based on the levels detected). Urine pregnancy test kits are calibrated ones, so unless the hormone levels in urine reach a certain level, they do not show positive results. They can also show false negative results. You can request your doctor/gynecologist to have a dating scan to confirm the probable conception date. Counting backwards from your expected due date (completion of 40 weeks of gestation) will also help to find your probable conception date (if your due date is available, calculation of probable conception date becomes easy based on regularity and duration of menstrual cycle length). Since you did not have menstrual period in between the sexual contract with two different people, it is difficult to comment on who would father the child. Sperms once released inside female reproductive tract can stay alive for upto 3-4 days. The egg once released from ovary can stay alive for 6-7 days. The accurate results can however be detected after Paternity test (to see who is the father of the child).
Take care.

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