My girlfriend and I were having sex last Friday, she was on top of me and the condom came off inside her. I don't know how long it was off, but it had spermicide. I didn't ejaculate, and as soon as I pulled out I checked the end of my penis for any precum - there was none as far as I could tell. Some came out after I started to lose the erection, but I'm not sure if any came out during the sex. I hadn't ejaculated for days, and I wasn't close to orgasm when I did pull out. I'm not extremely worried, but it's been eating at me since then. How much of a chance would you say. We've only had sex twice so far (that being the second time) and have been careful and used condoms.
i don't think you have much to worry about. precum usually doesn't have much, if any sperm in it unless you had ejaculated recently (and you said you did not). so, i think the chances are pretty slim.