Hi. I am a 31 year old woman who usually has regular periods. For the past 6 months my cycles have gone between 27 to 30 days in length. I had unprotected sex last night which was the 13th day of my cycle. Actually, it was after midnight, so maybe I should consider it the 14th day. I have no health problems, and want to know the possible liklihood of getting pregnant. Please let me know. Can sperm survive for more than 48 hours?