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thanks for the email. The warfarin can often make the blood more pronounced and/or take longer to resolve. I don't have a definite answer, but if this is a significant UTI, it could take about a week for the blood to clear. I don't suspect it should take that long, but it is possible. Hopefully, the doctor prescribing your antibiotics was aware of the warfarin.
If you are feeling better, there is not need to be alarmed.
I would recommend you finish the antibiotics and work hard to stay extra hydrated.
Spencer Chun, MD
My pleasure. Please have a wonderful weekend.