500 Cc Sub Muscular HP

I'm so ready to finally get some boobs! But I'm also still really unsure of the sizing. I'm 5'10" 125 lbs with 32A, possibly AA but not sure. Trying on the sizers at the surgeon's office, 500 cc seems right but looking online it seems like it may be too big. I also don't want to end up feeling like they aren't big enough.

Any one with a slim build have suggestions?

Tomorrow is surgery day! I'm so excited I can hardly handle it! It also seems completely unreal. The nerves haven't kicked in yet but I know I will be in pain. So, I'm cleaning house and trying to make sure I'm completely ready. Tomorrow is going to be kind of difficult because check-in time at the hospital isn't til 2:30 pm and I'm not supposed to eat or drink anything after midnight tonight. The plan is to drink tons of water today and eat a really late dinner.

Does anyone have suggestions on what to bring for the car ride home?

Yesterday was the surgery. It seemed completely unreal until I woke up from the anesthesia. Driving home wasn't too bad either, my boyfriend took it really slow for me :)
After propping myself up, I ate some soup. I've never had any problems with anesthesia or pain meds before but I spent pretty much all last night throwing up everything. We tried pain meds with food and without or with just water. Nothing was staying down which created a lot of pain.
Today is going better so far, aside from feeling like a stuffed sausage. Medication is doing it's job and the pain is already significantly less.

Also thought I'd post a few pic of before and after.

We visited the Dr. McCormack's office yesterday for the first post-op appointment. So far so good. Wound up going with 450 cc high profiles instead of 500 although it's literally just a few tablespoons less. My breasts seem really large but I think that is because I've been so flat chested all my life. I'm slowly becoming accustomed to them. While my pain is pretty well gone, my boobs are cone shaped and my abdomen is really swollen :( Hopefully my tummy goes back to normal and the implants drop into place soon.