When do you get ovulation cramps?

I've had all negative OPK's everyday since cycle day 6, AF is not due until cycle day 42-45. Currently on cycle day 29 and having ovulation cramps. Wondering why I still haven't seen a positive OPK. Any input? worried I'm just not ovulating AT ALL and don't have my next doctors apt for a few weeks to confirm if anything is wrong with me.

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