17 days post 400cc saline high moderate with breast lift. After surgery I went from B to C. What cup size will I end up in?

Dear Gunsdarose,
I understand your concern and it is quite normal to be concerned about the outcome following a breast augmentation surgery. However, you are still in the very early stages of the healing process at 17 days  post op.Your will need to be patient at this moment and follow what your surgeon has instructed you to do post operatively.At the early stage of the healing process, the tissues around the implants are still swollen. Once the swelling subsides and the implants drop to their final position, you will be able to see the final result of your breast augmentation surgery.
Daniel Barrett, MD
Certified, American Board of Plastic Surgery
Member, American Society of Plastic Surgery
Member, American Society of Aesthetic Plastic Surgery

Patients often think in terms of cup size when considering augmentation. Unfortunately, devices are sized in terms of milliliters (cc) of volume. This can lead to some confusion when sizing. Additionally, it is important to remember that cup size itself is not standardized with variations from one manufacturer to another. Unfortunately, as many women can attest their cup size in an industry leader such as VS is not necessarily transferable to another brand.
Another point which is often under appreciated is that of anatomy and starting point. Any implant will add volume to the volume which is already present. The implant is additive. A particular volume will not necessarily confer the same cup size to different patients (often times it will not even confer the same cup size to different breasts in the same individual...remember they are "sisters" not "twins"). 
A general rule of thumb is that 125cc can represent somewhere between 1/2 to a full cup size increase. Smaller volume differentials (25-50cc) are typically less consequential representing a volume change of less than a shot glass. However, I have found these numbers, at least anecdotally, to be of little help. Patients often present with notions/goals which do not correlate with these sorts of sterile volumetric assessments.
With regards to your specific question, predicting cup size is impossible. Implants of similar volumes will confer different cup sizes on different patients. This combined with manufacturer variability complicates this sort of prognostication.
The best advice is to "love the look...not the cup."
As always, discuss your concerns with a board certified plastic surgeon (ABPS).

I advise my patients that they begin to fill out their bras no earlier than 8 weeks post surgery. The cup size will be whatever fits you the best. It depends on how tight you wear it and where you shop. If you are 38 around and you wear 36- tighter will push you deeper in the cup requiring a bigger cup size. Some stores will measure you bigger than what you actually are- that's their secret.Dr. Ted Eisenberg, Board Certified Plastic Surgeon and AuthorRealSelf Distinguished Hall of Fame Inductee

Congratulations on your recent surgery!  Unfortunately, in breast surgery, it is sometimes difficult to predict what the final cup size of an augmentation or a reduction will be until the time that the patient goes out and gets refitted into a new bra.  The number size of a bra is the number of inches around the chest wall measured just under the breasts.  If you are a 38, that means you are 38 inches around the chest.  You may need to measure that with a tape measure to verify that you are truly are a size 38.  Some women have to go up or down on the number size of a bra to get a cup size that fits adequately.  A B or C cup is not simply just 2 or 3 cups of water measurement.  It is actually a measurement related to the original chest circumference in inches.  For example, if you are 38 inches measured at the chest wall and 40 inches around the breasts, then that would be a size B cup.  If you are 41 inches around the breasts then you would be a C cup.  Therefore, a 32C cup is significantly smaller than someone who wears a size 46C, eventhough it is still considered a "C" cup. Also, the 38 bra cup size may even vary from one bra manufacturer to another. One manufacture you are a"C" cup and another manufacturer you are a 'D" cup.  I usually recommend that patients wait at least 6 weeks after surgery before getting refitted into a new bra.  If you were 38 B brassiere before surgery and had 400 cc implants placed, I would think you would go up at least 2 cup sizes.  If you go shopping at Victoria’s Secrets, you may end up being a size DD cup!