Have kidney infection on antibiotic but now i'm stomach is starting bloat. is this normal?

Consider probiotics: Since your antibiotics may have altered gut flora. Also, bloating/gas may reflect malabsorption, intake of poorly digested food, foods known to promote gas (beans, fizzy drinks). Sometimes its more complicated--a stomach emptying too slowly, bacterial overgrowth syndrome, delayed intestinal function, partial obstruction from any cause, infection, rectum problems, ; pelvic pathology outside gut.