Anywhere from 8-48 hours after (or even a little longer sometimes.) Avg. 36 hours.
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Yes you can get 2 or even more positives in a row. You count off your FIRST pos not your darkest.
The OPK are like your body sending a message to itself and it can whisper that message and hear it, even if later on it begins to shout, it already had gotten the message when it was whispering. :)