Idk what to call this, just please help me if you can

So I had red in my underwear the other day. As usual I assumed my period would start the next day (it was 12 days early but last month I was 9 days early), but the last few days it has been either a really light pink color in my underwear but not very much or dark red/brown clumps. Some of them were sticky. Anyone know what is going on? I’m not sexually active btw if that helps.