constantly ovulating 🤔

Oriana
So I have pcos and I'm currently taking metformin and have been for a while now. When I used to use opk I would always get negative results but since I've been taking the tablets for the past 2 or so months, it shows everyday is a surge. 
I know fertitly tablets or treatment whatever can cause false readings so does anyone know any other ways I can check when my fertile days would be instead?Â