This is kind of embarrassing, but I had a question about breast development... lately my boobs have been super tender, and my boyfriend and I have noticed that theyve gotten bigger.... The first thing I did was take 3 pregnancy tests, and they all came back negative, so I know Im not pregnant. I know that people with CF tend to go through puberty kind of late, but Im 20 years old! Ive had my period for over 7 years now, so I dont really know whats going on. I was hoping to avoid involving a doctor, so I was wondering if anyone else has had this experience...? or know of someone, or some other reason (besides pregnancy) that my boobs would start growing and hurting?!