280cc silicone implants - too small?

I'm sorry to hear about the concerns you are experiencing after breast surgery.Although I understand your concerns, every patient's anatomy does limit how large of a breast implant can be utilized safely. In other words, the use of a breast implant that is too large for a patient's frame may be problematic in many ways. Given that you are fresh out of surgery, it is definitely too early to evaluate the outcome of the procedure performed.You should be aware that a significant percentage of patients at the early stages of recovery will feel that they are too big or (more commonly) too small. I routinely ask my patients to wait at least 3-6 months before evaluating the end results of the breast augmentation surgery. This waiting time allows patients to (usually) physically and psychologically adapt to the new body image.
For example, many of my patients report that as the swelling around the breast implants (for example, in the sternal area) decreases, they feel that their breasts appear more projecting. Also, in my opinion, the "drop and fluff” phenomenon does hold some validity; as breast implants “settle”, many patients feel that their breasts actually look larger.
Although online consultants cannot predict whether or not you will be pleased with the long-term outlook, of the procedure performed, it is safe to predict that the breasts will change. Do your best to stay emotionally even keeled. 
Best wishes for an outcome that you will be very pleased with, regardless of specific  cup size achieved.

Regardless of cup size, each patient will have a different anatomy to their breasts and have a range of implant sizes that will suit them.Preoperatively, you should have had a physical exam and measurements of your breasts, which the surgeon should have reviewed with you.Those measurements are guidelines for the range of sizes that may fit you appropriately.Your implants will not get bigger, your breasts can get bigger if you gain weight, but the implants stays the same size.Discuss your issues with your plastic surgeon and have him/her explain their choice of implants for you.

Thanks for your question.  Photos would also help in answering you.Without seeing you, I can only go on the available information:  5'7", 130 lbs, AA pre-operatively and a 280cc implant used.First, the difference between a 280 cc and a 300 cc implant is so small it would be hard to pick the larger one if they were both displayed on a table!You should give it time for the breasts to settle.  Some women are very narrow or bony and a smaller implant like the 280 cc (or using a high profile implant over a moderate profile one) may do the trick.That being said, I feel a 280 may not get you in the "large C, small D" cup realm going from a AA cup.