I am eighteen years old and just recently had intercourse for the first time but the condom slipped off and even thought he said that he didn't penetrate while it was off, and that he would pull out before ejaculation, I am still concerned. My last menstral cycle started fourteen days, and ended nine days before intercourse, however my menstrual cycle is highly irregular and can be months inbetween periods. The day after the intercourse I took the morning after pill (Plan B). What are the chances that I could be pregnant?