period 3 days late n 2 days short

I need answers!!! So same thing is going on with me, I was late by 3 days last week , I finally come on Thursday, it was kinda heavy, then it goes off that Saturday. then Sunday I see brown discharge .. Today while I was at work I went to the restroom to see my period back back it wasn't bright red . now it's nothing , what's going on with me?