Nnnnnnnnnnnnnoooooooooooooooooo, sperm may be determined little mother lovers inside a woman but the ouside world is a pretty harsh place, even if you had just wiped your hand off it would be almost impossible for them to live and fertilize your girlfriends egg, she would also have to be ovulating! I think you are safe since you say that you washed your hand, soap is a surfactant and so nothing on the top layer of your skin that is not permanantly there slips right off. Your fine so stop worrying!!!