I know opks are only positive if line is darker than the control line, but with that said I see many people post pictures with very faint lines or no lines and I seem to have multiple opks with darkened lines, not darker then control line though. And haven't noticed a positive yet. Is LH always present in urine with a surge right prior to ovulation producing a positive for a short period of time? I know my cycles are long but I'm going on like CD 30...