Brown when wiping for over a week..

Sheldon

Ok, so I thought I was starting my period last week bc there was brown when I wiped and that has happened the past two months a couple days before I started. But today makes a week that is been going on. No blood in the toilet or anything and I was supposed to start my period yesterday. I don’t think I’m pregnant (though it’s possible that I am) but it’s starting to worry me. Any idea why this could be happening?