Peeing blood

Li
So I was peeing blood today. And then I peed again and it was brown... Like old blood, and I haven't peed again yet but im still just scared to go to the bathroom again and I have to pee really bad. I'm going to urgent care tomorrow to get antibiotics because I'm sure it's a UTI, I been having discomfort for 3 weeks but never thought it was a bladder infection which was turned into worse