unexplained bleeding after sex- possibly pregnant?

I had sex with my boyfriend less than a week ago, unprotected, and he ejaculated inside of me. Im on the birth control implant, I've had it for over a year and I honestly cannot even tell you when the last time i had a period was. Last night, we had sex again but this time it was a little longer and rougher, but he didnt ejaculate inside me. This morning i woke up and there was like this brown blood texture all over my sheets and vagina. I looked it up and the first option came up was the possibility of pregnancy. I know its still wayyyy too early to check, I know it is not an STI/STD because i get checked after every sexual partner. I also read it could be due to trauma. Im hoping someone could shed some light in what im going through because I honestly cannot understand.