Spotting?

I've been on birth control for over two years now and my pill has worked perfectly every time. Recently my BF and I will have sex and he doesn't pull out. I got my period last month perfectly fine. I just got over my period this month and it usually ends after 5 days with barely anything there but now it's day 6 and I'm still having light brown every so often in my underwear and when I wipe. Could I be pregnant even tho I got my period or am I just over reacting ..