It is roughly supposed to be 12-36 hours after based on your brand, but I have heard that this can happen. You have to also think about how your body may gear up to ovulate and give a positive opk, but then gets delayed for some reason and you ovulate a few days later. (Not always, but it can happen). Temping is the easiest way to confirm that it did happen for sure, but I understand that can be difficult with a lo at home. However, if it is something you might consider I have heard that people can still see their shift even if it is a little off sometimes. If not, I'd suggest trying every day or every other day for at least 2-5 days after the positive. I'd also suggest trying on the days you notice fertile cm as well. Good luck!
I've reads loads of medical research on everything fertility. 96-100% of cycles with a positive OPK will have ovulation either the day of the positive or in the three days after it. 5 days after is extremely unlikely, though nothing is impossible when TTC.
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