How accurate is the ovulation prediction for you?

Al
Wondering what others think of the ovulation prediction on this app. Mine said my highest fertility was 16 days before next period, which was 2 days ago. Last night my bf finished in me and today I'm having slight cramps. I'm not sure if this is from 3 rounds of sex, if it's just in my head, or if I'm actually ovulating today 😅 
Anyway, thought others might be wondering the same thing! Thanks!

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