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A member asked:

I have been taking an opk test for 4 days so far around 3:00pm they have been positive when i take it again in 30 mins to and hour its negative why ?

A doctor has provided 1 answer
Dr. Jeff Livingston answered

Specializes in Obstetrics and Gynecology

Ovulation tests: Once you have one positive ovulation test then you should stop testing for that menstrual cycle. Ovulation should occur about 12-24 hours later so intercourse should be timed. Ovulation testing is not always accurate. It is actually detecting the ovulation precursor hormone LH not actual ovulation.

Answered 8/16/2015

2.4k views

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I had ewcm sat & sun & a lil mon. But neg OPK test. I had sex sun. Tues positive OPK test but lil CM i had sex. What r my chances. When do u hav sex?

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