Newly TTC and taking opk tests to determine O. Had a positive opk on CD 27, and then again on CD 36-37.. checked with a PT and it was negative. According to first +opk I should expect AF in 2 days, but if I use the second +opk it would mean a 52 day cycle which seems weird. Also, sex during CD 36-37 was very painful, like menstral cramps. Very confused about what is going on- help!