As long as you confirmed you have a urinary tract infection (UTI), you may attribute the blood found with your urine to your UTI and you are not rendered niddah.
If the bleeding occurs on a veset kavua, you may not attribute the blood to an external source and you would be rendered niddah.
Please note that, even on the day of a veset, you are not required to check your toilet paper nor look in the toilet for blood. This is the simplest way to disregard such bleeding.
Please feel free to get back to us with any further questions.
Refuah shleimah!