Has anyone gotten a positive OPK for more than the expected 1-2 days? I double- and triple-checked the tests with friends who have used them before to make sure I wasn't reading it wrong. I got 3 negatives on days 13-15 of my cycle, then positives twice a day for 6 days (16-21), then finally back to a negative on day 22. Has anyone experienced this and asked her doctor about it? Wondering if for some reason I didn't ovulate until later in my cycle (day 21) or if I ovulated earlier (day 16-17 is my regular pattern) and for some reason the positives were a mistake.