So Confusing - OPK

Can anyone help me out 😩 This goes from Saturday to Today, I’m not sure how I can go from fertile on the Sunday then not, then back to fertile? Surely I’m not ovulating for 4 days 🤔

I have heard they come back positive if you’re pregnant?

But I had a mild period last month, and took a few tests early on and they were negative.. any advice would be ideal! This is my first time TTC I have been since July.

Thank you ladies xxx