PCOS/BFNs/Pregnant??

Ok.... Long story short I have PCOS & started taking metformin 500mg 2x a day on Feb 2. My Ob says I should become Pregnant by April if not then she's gonna call in clomid. Well I got pregnant found out March 12& miscarried March 22. The meds works because I've gotten Af every month since February except may..... I even had AF after the mc.. I'm confused now because all I've gotten so far are BFNs & very sore boobies. I just didn't wanna find out 5 months later I'm pregnant. I wanted to see are there any ladies with familiar stories. I'll be calling for a blood test today.