I have been charting for the past few months and always have a temperature drop on the same day that I get a positive OPK for an LH surge.

This month, I had a serious temperature drop (I even took my temperature twice just to be sure it was real), followed by a positive OPK the NEXT day.

My question is... when exactly does ovulation occur around a temperature drop? I believe I ovulated on CD 14 because I got a really dark test that day.

I posted my chart and a photo of my tests below. Bottom test is CD14 and the one above it is CD13.