So I took the first OPK at 10:50 this morning and it was much stronger than any of the others I've taken. I was told to test again later and it'd probably be darker, but three hours later (didn't pee in between these times) its fainter. I was gonna test again later at like 7 or 8 but what does this mean? Was that my surge even if it wasn't all the way positive? Or is it possible it'll still be darker later on today? Thanks so much, I'm just so new to this I want to make sure I don't miss my ovulation day.