How long after the LH surge does ovulation occur? When should the intercourse happen?Most people will ovulate 12-48 hours after the LH surge is detected, most common is 36 hours after the actual surge. One should get a bit more notice, 24-48 hours, by ovulation testing in the afternoon. It's best to have intercourse the day of the LH surge and the two days after. Also consider "insurance" sex for one more day in case you ovulate late. Perfect timing would be to have had intercourse the day before the LH surge as well, but that can be hard to predict for those with an irregular cycle. If you don't know when you might ovulate, having sex every other day from cycle day 10 through a positive OPK.
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