Used cocaine 11 days after my Breast augmentation, will I be ok or should I be worried?

Do not proceed with your surgery as you are at marked increased risks of complications from both recent use of cocaine and ongoing nicotine use. You need to have medical clearance at a minimum from the anesthesiologist who needs to know of this history, and need to be off both cocaine and nicotine for months prior to elective surgery. I also strongly recommend that you are candid with your surgeon and never hold back medical details that could affect your health. There is a sacred patient physician relationship restricting him from sharing any of your medical information

It is likely, unless you have noticed a change in breast size, that no harm has been done. Your  are wise to avoid the use of the dangerous drug forever.  See your plastic surgeon if in doubt. Best wishes.