I am 18 years old and night before last me and my boyfriend had sex. Second time around (with a new condom) we went to change positions and I noticed the condom had slipped off sometime while we were having intercourse. He got it out okay, and he told me he never finished. I am a concerned that I could be pregnant. Is there a chance that I could be. Every one I talk to says to not worry about it, but I cant help worring!