My girlfriend and I wanted to have sex. So when I got a condom out, it was an ultra thin Trojan condom with spermicidal lubricant (said so on the package). She wasn't very wet when we started having sex, and the condom broke in her. I noticed that my penis had a white substance on the tip. I don't know if it's precum or the spermicidal lubricant. The condom was the only form of birth control we used. Plus, she starts her period in approximately five days, give or take two days or so. What are the chances that my girlfriend is pregnant?