Good question: There is some variability in9 the accuracy of the available otc ovulation prediction kits. If it's working, then the ovulation should occur for the overwhelming majority (>95%) of patients who experience the lh surge. You can have your doctor order a day 21 Progesterone level, and that will confirm ovulation (or prove it didn't occur), to help you be sure.
Answered 6/16/2018
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