I have patients take antibiotics (usually Keflex unless they have an allergy) for 24 hours after BBL (and almost all surgeries). There is no good evidence that antibiotics have any benefit beyond 24 hours after this type of surgery.
Only the plastic surgeon who performs your BBL can answer that question as he/she will know of any complications in wound healing.
The first 3 to 4 days tend to be the worst for most BBL patients. Many of my patients feel well enough to return to work at 1 week, but some patients may need 2 ...
I have my BBL patients avoid sitting for 10 days after surgery except for using the toilet. This means they are either laying on their belly or their sides or standing during this period of time. When they go home after surgery they typically lay down on their side in the back...