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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!
Ovulation Predictor Kit Frequently Asked Questions. Ovulation predictor kits can be purchased online at Early Pregnancy Tests. Pricing ranges from $1.10/test to $.55/test based on the number of tests you purchase, and shipping is free for orders of $15 or more.he first is so that you can see if your LH surge corresponds properly with your thermal shift. You should shift 1-3 days after your positive OPK, though sometimes it takes as long as five days for those with a slow shift. Another reason is to make sure your temperatures stay up for at least 10 days after ovulation.