Pregnancy, ovulation, discharge HELP

During my fertile week, I always get clear discharge which lets me know I am fertile. The question is, does that necessarily mean I ovulated the day that this happens or does the discharge just come at a random time in the fertile week?

I’m asking because I got clear discharge about 4 days before my expected ovulation day (The 1st) according to this app which I know isn’t necessarily accurate. I had unprotected sex on my expected ovulation day, which was a few days after the clear discharge. I took a plan B almost 72 hours after sex. Shouldn’t I be okay?

(Sorry, wasn’t sure what topic to put this under😁)