I am 18 year old male, I had unprotected sex with my girlfriend. It was my first time so I ejaculated within 2 minutes inside her vagina. She had her last periods started from 24 December, we had sex on 17th day that was yesterday 09 January. She took unwanted 72 within 24 hours. We are worried about pregnancy. What are possibilities for her to get pregnant? What are possibilities of pregnancy if she will have withdraw bleeding? When she will have normal bleeding if will withdrawal bleeding? At what point of time we will be assured that there is pregnancy or not? Please Answer we're very worried.