Birth control spotting?

Okay so me and my boyfriend were having sex and we did it for the first time with out a condom and when we did it I had this stuff come out almost like i was spotting or something but it was more brown than red. And no it was not poop. Any clue what it could have been. I havnt had any spotting yet since i started bc 2 months ago but part of me thinks that is what it is. Any other ideas?