my boyfriend said he ejaculated on friday night and urinated saturday morning and afternoon, we then hung out saturday night and we fool around, i was sucking him for a while and precum was coming out then we took a break to eat some food and some drinks. about an hour and a half later we went back up stairs and did some 69. after that he just went inside me for about half a minute then went out. he did not ejaculate but there was precum on his penis. i also just ended my period the day before. what are the chances that the precum had sperm in it? how likely is it i could be pregnant?