Me and my girlfriend had sex during 3rd day of her periods. I accidentally droped a single drop of my sperm into her. But she immediately went to toilet and did pee and also did some bleeding as she was in into her periods. how much is the possibility of her getting pregnant. she had one contraceptive pill unwanted 72 within 36 hrs is one pill enough to avoid pregnancy. and what shoul we do if in case she missed a pill to eat within 72 hrs. Having what should we do to avoid pregnancy after 20 days of unprotected sex.?????Please help me i am in a big trouble