am i prego or what’s wrong w me?

okay so me and my bf had sex on the last day of my period and we used a condom and he didn’t finish (that was the last time we had sex) ab 3 weeks ago and i’m suppose to start my period in 8 days. My boobs have been bothering me since my last period but only when i touch them. Yesterday i would randomly get pain in them with out touching them but it didn’t hurt as bad. but this morning i got the worst pain near my nipples for ab 30 min straight and it made me tear up, i’ve never felt pain like that. my boobs have definitely gotten bigger in the past few weeks. i’ve always had an irregular period. i don’t think i’m pregnant but i’m taking a test next week if i’m late on me period just in case. does anyone know what this could be?