Help! Opk getting lighter??

OPKs went from light, to darker but not same dark as the test line, and now lighter again.. no positive. Tomorrow is supposed to be ovulation. Should I be concerned that they’re getting lighter and not darker? I haven’t had any CM yet so I don’t think I ovulated.. TTC is literally going to make me crazy. Lol. CD12. Cycle usually about 23-24 days. Also- ignore the spill lol.