Petite 22 Year Old Wanting Full Breast but I Don't Want the Tennis Ball in a Sock Look, Options? (photo)

In order to make an accurate size recommendation, I would need to assess your chest wall and breast mound measurements and characteristics.  Unfortunately, there is not a general rule of thumb or objective criteria to implant selection.
Your plastic surgeon will perform several measurements of your chest wall and breast anatomy and determine a range of implants that both fit your chest wall and reach your desired goals.
The next step is to try on this range of implants in the office with your doctor.   The key to this success is showing your surgeon the body proportion you desire with a bra sizer and allowing your surgeon to guide you to the right implant.   It will be much easier to communicate in implant cc's than cup size when determining the appropriate implant for you.
I wish you a safe recovery and fantastic result.
Dr. Gill

Implant volume and final cup size vary considerably based on a woman's overall frame. At 5'2" with a 12cm breast width, your options for choosing implants are limited unless you want an obvious "augmented" appearance. More measurements are needed, but a basic range would be up to 300cc in a moderate plus profile or 375cc in a high profile. With your small frame, 300ccis likely to be plenty to get you into a 32 C cup bra. Form stable implants are an option and lead to less of an "augmented" appearance, but they do require a larger incision for placement.