Hi. My Boyfriend Wiped His Pre Cum From His Penis

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?