... urgency burning -constant even when not going and pressure . My doc did a sample and said it was negative but mine was positive with the symptoms. I am on Microbid - 4th day. I also feel a fullness in m lower abdomen is this a normal feeling - it just feels full and uncomfortable. Almost feels like I am constipated but I am not. I am worried it is something else but I am not sure what as it is classic UTI ...