Does an OPK stick get darker the closer you get to O day? Or is it barely there and then all of a sudden dark?

Kimberly • 26 years old - Current Housewife/Future SAHM

I'm on cycle day 8 and I've tested on CD6 and CD7 because I have no clue when or if I even ovulate (my cycles are very irregular and long). CD7 was a bit darker than CD6 so I was just wondering if there is anything to that. Thanks!!

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