Hi. My boyfriend wiped his pre cum from his penis (no ejaculation) and several minutes later placed his penis on the outside of my vagina (vulva) for maybe a minute. Within 2 hours of the incident I took an emergency contraceptive pill just to be safe. This happened a day after my periods ended (on the 6th day of my cycle). I have regular periods with a 27 day cycle. What are the chances of being pregnant?