I'm a 20 years old boy, 2 weeks ago i Had sex my girlfriend, had the urge to ejaculate while penetrating but i managed to hold it in, i wasnt wearing any condom, but i guess my precum was in contact with her vagina, i urinated after the foreplay , before the sex. Her period was delayed for 2 weeks at the time where we were having sex, im worried that she might get pregnant , what do i do . We used lube too, and lube are said to kill sperms do they?