Is Bactrim DS 800-160 the proper antibiotic for a postop incision infection? (Photo)

I had bladder suspension surgery and the surgeon attempted to do it robotically but couldn't get through adhesions from previous surgeries so he had to open me up. I started running a fever off 100.3 within 18 hrs then up to 100.9 within 24 hrs. I was given 2 doses IV antibiotic fever went away. Discharged the next day and the day following discharge put on the Bactrim DS 800-160. Necrosis? Cellulitis?