My predicted O day has been off

Kate

So I think I've been missing my ovulation nearly every month except October when we got pregnant be but ended quickly with a chemical. So I was taking the test strips and it says I ovulate two or three days before my predicted day that my two apps say. So I should ovulate tomorrow. We had sex last night and I told my fiance we do it every night this week haha just to see if that works. Because before we were completely missing day 13&14 thinking day 16&17 were the best days. So wish me luck and definitely buy some opks if you're serious about ttc !