Pregnant? Discharge changed color

Okay so I'll start it off with that my boyfriend came in me when I just started my period and I didnt take any plan b after just because we thought I wasnt going to get pregnant, but now I'm a little worried. My discharge has changed color to this brownish color (not the color of old blood coming out which is usually darker for me) and I looked it up and it said it could be that I'm possibly pregnant. I'm going to end up taking a pregnant test soon to find out for sure but I was wondering if anyone had any input about it? (Picture 1 taken in bright light, 2 with no flash, and 3 with flash)