HI hun.
Firstly welcome 
I had submuscular, didnt cause pain, but i was very tight and achey! I went from a 32“ bck with no cup to a 32E (well thats too tight now!!)…. I only look a large B small C, as implants measure bigger than they look! So if u wanna be a D tell surgeon u wanna look a D
Sizes differ from woman to woman hunni, so a surgeon is the best to listen to re sizes.
Im sure girls on ere will help u loads xx