3 periods since June!?!

Darcy
So Hubby and I are trying for #2! We have a 15 month old son who is the biggest and best blessing ever as I have PCOS. I was diagnosed in 2010 and prescribed Metformin but I never took it because I was young and didn't really care, never taken it since. I did get pregnant in July 13 which ended in a mc. I got my Nexplanon removed 6/8 and I've had three periods since! Could I still be ovulating? I'm just so confused now that I'm actually trying! Any advice is appreciated! :)