this is a breast-health related question and not a vag one but I'm hoping it's ok still.
History: I was put on Yaz at the age of 17 for acne/birthcontrol (my mom wanted me on it because I would be in college the following year anyways) and after a few months developed a cyst in my left breast. My doctor confirmed it was a cyst and explained to me what they will normally feel like because a few months later I found another one. I put up with the cysts for a few years because I liked how yaz worked for my periods. This past summer I changed to nuvaring because I finally got sick of sore boobs and realized that the Yaz was probably behind my cystic breasts to begin with.
Recently: I was doing a BSE (encouraged by my doctor just because I have a tendency to have cystic/dense tissue in my breasts) and most of the cysts in my breasts have gone down (no longer feel large/sore). I found a new lump and this one doesn't feel like a cyst. It is much more solid and seems to be attached/fixed to my ribs. Exactly how worried should I be? I don't want to use Dr. Google and I'm going to call for an appointment with my gyno tomorrow but wouldn't mind some reassurance until then.
Also: i'm 19, got my first period when I was 10<which i know is a risk of breast cancer, but no family history of it.