App says I’m in my fertile window, but I don’t think I’m ovulating. Had an accident last night

High there

So as the title says, my fiancé and I had a condom-fell-off accident last night. I got a plan b first thing this morning, and I’m not super worried about getting pregnant but my app says I’m in my “fertile window” rn, however, I’m not ovulating, I can always tell when I am.

Is my fertile window probably just incorrect on this app, or is my highest risk of pregnancy not during ovulation?