Bro not to hate but if you won't use condoms and if you don't know about post pill and it's used as well as it's side effect, don't have sex. Sex is not a game and if you treat it as such you'll be forced to grow up way quicker than you imagined. Be a responsible citizen and learn the details before plunging head 1st, no pun intended. You have 72 hours before fertilization occurs but the sooner the better. And also it's not recommended to take post pill more than once b/c it's effectivity decreases and also has side effects on the girl.