Could i be pregnant?

Patient: I was due for my period a week from yesterday and ended getting it early, I started yesterday. I have been having unprotected sex for the past few months. My period is not normal at all. It usually consists of awful cramps for the first 2 days and after those 2 days they ease off. This period isn’t actually blood. its mainly brown discharge but its not constant. It comes and goes. There is a little bit of blood when I “check tampon”. But almost all brown. Like I said earlier its not excessive but theres hardly any blood. And there is no cramping at all. My main questions are could I be pregnant? If not what could be causing this.. I have been tested for stds, and have had an examination down there while being with my current partner.

Symptoms: Odd period. Brown discharge, Little blood