I'm just wandering...?

Ummmmm I know thiss iss tmi but wat does dark rings around Mii mean??... I had brownish spotting ((again tmi sorry ))a couple of days before Mii monthly was supposed to start and I'm starting my 3rd month of yaz could this mean I might be pregnant or is it a side effect of yaz??... I had almost 4 weeks ago I missed a couple of pills too.. =(