Blood in the urine(Haematuria) may be due to many causes like Urinary tract infection
,Kidney Stone,Stone in the ureter/bladder,Cancer of the Urinary bladder
As per your Urine culture,you are taking Antibiotic.
But,it is not controlled.
So,you have to get investigated further with X ray abdomen KUB(Kidney Ureter Bladder),Ultrasound abdomen,Intra venous pyelography(IVP),Cystoscopy
etc with the advice of urologist
Hope it is a simple infection,but be cautious and get investigated.
Wish you good health