Metformin

I'm on metformin and have pcos... had my period December 4th ... havent had my period this far. But i was having a bit of discharge. Which i thought was weird. So I took a pregnancy test. Which was negative. So for shits and giggles I decided to test for ovulation... and look... what the hell.. I didnt have a period. Can I possibly have ovulated late ??? Or possibly ovulated twice ??? I'm so confused .. obviously we did lots of baby making... lol cause not gonna miss the chance... but I'm cd 40 and tomorrow 41. Anyone else had this happen before with metformin