A member asked:

I took an ovulation test this morning and it was positive and tonight its negative. did i miss my window?

A doctor has provided 1 answer
Dr. Brian Nguyen answered

Specializes in Obstetrics and Gynecology

That's possible: Ovulation kits generally test for LH, which surges prior to ovulation and after ovulation begins to drop. It's possible that your positive result came on the last day that your LH level was high enough to be detected. you may want to begin testing earlier.

Answered 11/4/2018

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