Today I had sex with my boyfriend for the second time. We've been together for over a year and lost our virginities to each other. While we were having sex, I freaked out thinking that the condom had broke because I abnormally wet down there, and when we checked, I had blood. It seemed an abnormal amount though, as it was enough to slightly stain my inner thighs as well. Why might this have happened? I didn't bleed the first time, so I just want to know. May it be an STI or something?