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A 19-year-old female asked:

why did i get a positive hpt the same day i had sex the next day ovulation test positive and the day after that 3 hpt positive am i 3 days pregnant?

4 doctor answers6 doctors weighed in
Dr. Arash Rahi
Urogynecology 22 years experience
A few reasons: Sometimes the different "antibodies" (compounds in the blood or urine that bind to different proteins, etc) can turn a pregnancy test positive. The best way to know if you are truly pregnant or not is by presenting to your physician who can run a confirmatory test to better asses your pregnancy hormone level. Some other hormones also can cause that test to be falsely positive.
Dr. Michael Traub
Fertility Medicine 19 years experience
Cross Reaction: Lh which turns positive on ovulation kit is very similar in structure to pregnancy hormones hcg. So it is possible to have cross reactivity between the 2 tests.
Dr. Kevin O'neil
Urogynecology 28 years experience
Probably pregnant: There may be some cross reactivity between the ovulation kit and the home pregnancy test. If you've had, 4 positive pregnancy tests then you are likely pregnant. See a doctor and they can help you figure out how far along you are. Good luck.
Dr. Heidi Fowler
Psychiatry 25 years experience
Timing off: Don't bother testing 1 to 3 days after sex. Wait 14 days or until a period is missed.

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Last updated Oct 24, 2017
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