Help!

Ali
Hi! Ive been on birth control for a while. Two weeks ago I had a very very light period( isn't too unusual, but this last time I kinda thought was weird bc there was very very little blood and mostly brown discharge). In about a week in a half I'm suppose to start my period again ( according to my pill cycle). I skipped my pill on Monday and Tuesday( I'm horrible about it). My bF and I do have unprotected sex. As of Tuesday I started to have a brown discharge. I have experienced it before when missing my pill a couple times, but it's been going on since then. It will thin out but resurface again thru out the day. I'm just not sure if maybe I could be pregnant or if it's the pill!! Any advice will help!! Please!