Hi doc, how can i prevent a five days unprotected sex from getting pregnant?

Cross your fingers!: Emergency contraception is the only safe method to prevent pregnancy after unprotected sex. It is best done within 72 hours, but may be effective if done by the fifth day. If it has been more than 5 days, then you can try crossing your fingers, making a wish, or praying, because it is out of your hands at this point. Also, get checked for std's right now, because you can treat that.