Idk what this is???

Hailey
Ok, so I started my period on the Thursday, well my second day is ALWAYS the heaviest but when I took my tampon out there was nothing  on it, I put another one in just to be on the safe side I took it out this morning and there was a little bit of brown blood on it??? My last period I had started for two days then stopped and then a day later came back but my blood was brown?? Can someone please help me???