My few semen drops might come around her vagina while removing the protection and she immediately cleaned it and she's a virgin I just inserted on her butt.... she took Ipill after 4th day of the intercourse but her expected period date is 15th of every month but there is 9 day delay and we have already undergone the pregnancy test after 9 days and the result turned out to be Negative. what might be the possible reasons for her delayed periods??