Yes: OPKs just measure urinary luteinizing hormone. Once the level gets above a certain cut off the test turns positive and usually stays positive for a few days. If you don't ovulate every month the level may occur much earlier or later in the cycle or not at all. Don't forget the P in OPK stands for prediction, not guarenteed.
Answered 3/10/2015
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A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
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