2 days ago I had an almost positive LH test, but never got a true positive. (A second test a few hours later was the same.) Yesterday afternoon and this morning, the tests were like a shade lighter. I'm on CD13 today, and have not had any ewcm.

Last cycle was a positive OPK on CD18. I've always had a surge show for at least 24hrs. Always. And never had a positive this early. Does that mean I missed it? Or can LH surge again?

App predicts I'm just now starting my fertile window, but this is only the 2nd cycle I've used it and I have PCOS with irregular cycles so I know the app could be wrong.