Are 450cc high profile breast implants too big for me and is mild pectus excavatum going to be a problem? (Photos)

I’m 22 years old, 5’8, size 32AA and 125lbs with mild Pectus Excavatum. Breastfed two children, size 32C while breastfeeding. My nurse thought that 450cc high profile looked great, so did I. I’m now second guessing myself and maybe I’m wanting too much boob because I have none currently? When I was breastfeeding I still would have liked them bigger. I don’t want to regret the size, too big/too small. I’m wanting plenty of boob to hide the dip in my chest! I would like to be a small 32D.