I’m 18 and my boobs have been feeling slightly heavy and a bit sore, but not to a point where it 100% bothers me at all. I fooled around with my boyfriend around 1 week and a half ago but we didn’t have sex. We both had underwear on and no ejaculation occurred around or near my area....I started to feel this boob thing 3 days after seeing my boyfriend. I get my period in 10 ish days. What do you think this is?