OPK shades

Kate • 33. Canadian. TTC #1 since Aug. 2014. PCOS. MC in June 2016. Uterine septum and ovarian cyst removed January 2017. Started Metformin January 2018.
I track my cycles with OPKs starting quite early so I can pinpoint ovulation as I have wonky cycles from time to time. I know CD6 isn't positive, but is it normal to have a darker opk early in the cycle, then light again, and THEN ovulate later?
Thanks for looking and responding. 😊

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