Day 20 and no positive opk

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I stopped taking my birth control pills on Sept 22nd. Got my normal pill period on Sept 27th and it ended on Sept 30th. I started doing ovulation tests around cycle day 8. I am now on cycle day 20 and haven't had a positive test. Should I just assume I won't be ovulating this month or is it better to continue to take them to see if I ever get a positive.