Should I be worried?

The week before my period was due i started bleeding and had a normal period. (I get this sometimes on the pill) My period came right on time when I took my pill free week then two days into it I started getting this blood mucus stuff? I haven't had sex in a year but have done other stuff (fingers) the same week the first period came. Sorry if it's really confusing! My mum has PCOS so I wasn't sure if this was an indicator of that to and if that's something I should look into. Thanks!