i cant calm down someone help!!!

last Thursday I had oral sex with my bf!! he swears he got no precum in me he's not worried at all cause he says he knows I'm not pregnant. 3 days later my boobs started to hurt and now they are swollen and feel like there getting better. he says it is PMS but I never had my boob hurt at all and its only happening to my right boob i'm expecting my PD on Friday I'm soooo scared could I be pregnant?