I have been trying to track my ovulation. In the past (when I was not trying) I would really just go by CM and O pains, but who knows how accurate that is, and really, I didn't care because I wasn't trying.
I started doing OPKs on CD 14 and have taken one every since. The one on the 14 looks the darkest, but that was after the 10 minute time frame or whatever, so I doubt it's accurate. The OPKs are making this stressful, so if I don't get a BFP this month, I just don't think i'm going to do them!
Is it usual to not get a + OPK and still ovulate? Maybe I missed my surge or something? Who knows.