Confused

So I have PCOS. Been TTC my 2nd for 4years. I haven’t had my period since November. My back has been killing me for a week. I’m heavy but just started moderately working out at the gym for a week. Today (2/8/18) my back is still killing me. I thought I was starting my period today cuz I had a little bit of red blood. But it went away and now I only see brown light spotting. Only symptoms I have is a backache and not feeling to well. Anyone go through something similar???