its better to repeat the urinanalysis and culture maybe it's another organism that is causing the new infection which is resistant to the antibiotic you took.
and if you are a female you need to be see by a gynecologist too, specially if you have any vaginal discharge.
A urinary tract infection (UTI) is an infection in any part of your urinary system ,your kidneys, ureters, bladder and urethra. Most infections involve the lower urinary tract ,the bladder and the urethra.
Antibiotics are the typical treatment for a UTI. But you can take steps to reduce your chance of getting a UTI in the first place
some tips are :
>Drink plenty of water to dilute your urine and help flush out bacteria.
>Avoid drinks that may irritate your bladder. Avoid coffee, alcohol, and soft drinks containing citrus juices and caffeine until your infection has cleared. They can irritate your bladder and tend to aggravate your frequent or urgent need to urinate.
>treat the infection by taking the full course with necessary dose needed
>if the problem worsen ,or you have other symptoms of vaginal discharge re do a urine test and check with gynecologist if there is a fungal infection if you are a woman