Fibroadenomas

Hi, I’m 15, I eat healthy, I exercise 6 days a week, and try to sleep at least 7 1/2 hours a night. I recently found a hard, tender lump in my chest and then a second one appeared on the same side literally overnight. My doctor said it was a fibroadenoma and I have an ultrasound, bloodwork, and a specialist appointment tomorrow. Does anyone have experience with this?

(P.s. I should add that I don’t have dense breast tissue and I sometimes go months w/o a period as I know some people will say that they can occur right beforehand but I have no PMS symptoms and my other breast is completely normal.)