hi, i'm 19, go to college and last night there was a concert. I ended up going home with a girl there and having sex, and in the process the condom broke and i pulled out immediately. I couldn't have been in her for more than a second but im still concerned i might have caught something. Should i be worried? I should mention that the girl did not seem to be a person who is promiscuous but you never know. I also just got out of a 2 year relationship and was a virgin before that so i kind of new to all this stuff. Please help im kind of freaking out.