What to do if i have a mild case of pinworms. is it possible that my girlfriend will get it to. like from kissing or having sex. or even by laying in my bed?

Both you & your: girlfriend should be treated. Yes - lying on your bed (contaminated linens) or intimate contact can spread the worms. Pinworm treatments include anthelmintic medications like Albendazole (Albenza), Mebendazole (vermox) or pyrantel (Pin-X, Antiminth). Good handwashing is important. Wash clothing that has been worn recently, bed linens, upholstery and carpeting