TJust curious as I am going to the dr next month for end of year physical and it would be nice to know what dr's found that caused your growth to try and have him look for vs just a standard lab test. I can't imagine with the changes of the last year up top my chest is going to go unnoticed. But unsure if drs actually point that out or wait for patient to note it. It would be a bit embarrassing either way to have it noted, or note it myself.
I think a doctor, especially a male one, is not going to bring up the issue of breasts by himself. Even after mine had a reached a B cup, he said nothing about them even when he was checking my heart which he does every time I see him. Up to that time I never wore a bra in my visits. You will have to bring up the subject. I had an under breast rash which I saw him about, and he didn't bring up the subject of my breasts (I had already accepted them and wasn't interested in an operation). The next time I saw him I wore a bra which he noticed when doing the heart check and he still didn't say a word about them or the bra.
So don't depend on the doctor to say something. If you have questions on your growth ask him/her - he may refer you to an endo to check your hormones (if you haven't done that yourself already).
I agree with the other two about finding a quiet time to sit down. Another possible opening is that you have a medical condition that you want to discuss with her.
Breasts usually don't show much laying in your back, and only a little more on your side. She may not have noticed yours, especially if her focus is on going to bed.