I really think I have a UTI. Iv been feeling chills, more nauseous than usual, frequent need to pee even after emptying my bladder, and constant pressure on my pelvis. I am currently 13 weeks pregnant. I went to the doctor's and had a urine sample, and they said it came back negative. But why am I having all these symptoms and should I go back for another urine test. I see the doctor in 9 days but I am not sure if I want to wait that long to see him again.