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First time OPK user

Jen. • Fri, Sep 12

Ok. I am on CD13, and have been using OPK's since CD11, since all three of my apps said this is my fertile week. They've also said my expected O date is the 14th.. But it looks like these lines are getting lighter?? Anyone experience this? Could I have O'd before CD11, which would be only 6 days after AF ended? Or could I O later than expected?? Help!