so i went to urgent care about 2 weeks ago with a UTI. they only did dip stick test and prescribed me macrobid which did not get rid of my symptoms. my only symptom is urgency with little pee coming out. i went back and they did a culture and prescribed me a different antibiotic. the culture came back negative, but they told me to finish the antibiotics. why do i still have these symptoms if my culture is negative? can it be something else?