Could I be pregnant?

caitlyn 💛 • aquarius♒ 9.29.16 💟

So my boyfriend and I were having sex last night and he ended up cumming inside of me. I'm on nexplanon and have had it in for two months so far, but I just started bleeding last night and it's very very light, it's just like a faint tint of red in my urine and when I wipe. I was wondering if I could be pregnant? or if it's just my period? we don't use any protection besides the nexplanon