Thank you for posting. While, in your case, you aren't pregnant since you had a period after this occurred. It is possible, although rare, to get pregnant with a man rubbing his penis on your vagina. Preseminal fluid, or precum, can sometimes contain sperm and if this is the case then it's a risky sexual act to perform with no protection. For future reference, please use a condom if you and your boyfriend are going to have any type of sexual activity-- not only to avoid pregnancy but to avoid the possibility of contracting STD's.