Hi, My Girlfriend and I made out on 1st of September and we doubted that some pre-cum might have come in contact of her vagina, so she took unwanted 72 on 4th of September. After that She had withdrawal bleeding from September 11 to 15. Her last period was 23 August to 27. Her periods were due on 21 September but she haven't had them yet. So when can she expect get period? And is there chances of pregnancy?