Counting DPO??

Tina
I think I posted this question already but I'm not sure. If I got a positive opk on the evening of May 18th, does that mean I count my ovulation day on the 19th or 20th? Or do I count my ovulation day the 18th since that's when I had the positiv opk? Just trying to figure out when to count DPO. Thanks.

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