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Posts: 2,427. Hi there, OPK detects LH Surge, which in most cases occurs 12-36 hours BEFORE ovulation....if you got your OPK at 8.45 am yesterday morning, you could expect to ovulate anywhere between yesterday evening to tonight!
You will start to get a negative on an OPK within a few hours of the positive but still may not have O'd, so it's best to start BD'ing when you get a positive OPK and continue to BD for the next few days.