I recently had a breast revision from 300cc to 500cc. What size bra should I be? I don't feel as big as I should be. 4 days out.

There is no accurate/direct correlation between breast implant volume utilized and resulting cup size; in my opinion, “the 200 cc of a breast implant change equates to a cup size” statement simply does not hold true in many cases. Cup sizes are simply too variable;  discussing goals and/or outcomes of  breast augmentation surgery in terms of achieving specific cup sizes is really not helpful.It is not unusual for patients to have your concerns after breast surgery early after surgery; at this point, time and patience will be your best friends. Continue to follow-up with your plastic surgeon who will always be your best resource for information and/or reassurance.  Best wishes: hopefully, you will be please with the long-term outcome of the procedure performed ( best evaluated 6 months down the line).