I Am 5'2 125 Lbs 32a Breast Aug with Silicone 390 Ml What Cup Size Will It Give Me?

Although your curiosity is understandable, there is no way to know ( with any degree of accuracy) what bra cup size you will wear after your procedure.  As you know, bra cup sizes will vary from one bra manufacturer to another.

 Best wishes;  hopefully you will be very pleased with the outcome of the procedure performed regardless of the specific cup size achieved.

     In an average size women, 200 cc will increase the bra size by one cup.   Therefore, 390 cc would increase a woman by 2 cup sizes.  This is extremely inaccurate, and trying on sizers in the office will offer the best opportunity to make that decision.  Find a plastic surgeon with ELITE credentials who performs hundreds of breast augmentations and breast lifts each year.  Look at the plastic surgeon's website before and after photo galleries to help determine the plastic surgeon who can get you to your goals.

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