Unlikely: Need not test more than once a day. If you do not test every day from before you expect to be most fertile, you may miss the surge. Likewise, if you test too late, you may miss the surge. Also, it may not be possible to tell if you are about to ovulate or if you just ovulated since you will have increased lh in both cases. Usually, though, the positive OPK means that you are about to ovulate.
Answered 2/13/2015
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