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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!
The 12 to 36 hours between the beginning of the LH surge and the moment when your egg is released is the most fertile part of your cycle and the most likely time for conception. Saliva-based OPKs test for rising oestrogen levels as you near ovulation, not the hormone that triggers it.