hi i was just curious about something involving my girlfriend. about 5 months ago we had a sexual encounter in which i was scared that i might have had semen on my fingers and then i accidently touched the outside of her vagina. she has had regular periods ever since then, so ive figured theres no way she could be pregnant. this week she is complainign that she think she has been gaining weight, and that it seems to flucuate sometimes between 130 and 140 pounds. she used to run alot but hasnt had time to exercise as much. she is 17 and pretty tall about 5'9". i no that being a guy that i could eat as much as i want and be lazy and i wouldnt gain a pound, but is it harder for girls to maintain thier weight. i doubt it is related to pregnancy but do u think that is possible, she hasnt had any other symptoms, and says her self that shes not pregnant, but im really paranoid that thats why shes having these changes in weight. so my question is do u think these weight changes are normal being a teenage girl.