You situation may be surgeon-dependent. I recommend a detailed discussion with a surgeon who you are comfortable with and who is a board-certified Plastic Surgeon certified by the American Board of Plastic Surgery.
Harvard Educated, Beverly Hills & Miami Beach Trained, Double-Board Certified Plastic Surgeon
If the infection is gone by the time of your surgery, you should be fine. Best to follow your surgeon's advice and discuss with her.
Resolved infection will probably not postpone breast augmentation.
With two weeks of treatment a strep infection should be totally cleared up and would not post on the operation. However, your surgeon will reevaluate your situation just before the operation.