The story goes something like... I have a twin sister who is 18. We both go to the same school and are relatively close. She got knocked up by this guy last year. Throughout the entire year she was pregnant and had her baby in January. I am now a happy uncle and Godfather. I have also been dating this girl who has helped me through it (it has been kind of hard) for the past 8 months. A lot of times we do stuff I get these irrational thoughs that she might be pregnant, even though we haven't had intercourse. The thoughts that say "well, what if the sperm traveled across the room and went inside her" kind of thing. I worry way too much about the stuff we do. What can I do about this? From one stand point, there is NO way for her to get pregnant, but I always think there is. What should I do? We also don't engage in intercourse. I would like to get over this before we do.