Pressure... TMI

Shikiera • Very nice, outgoing, open-minded, caring, compassionate, and most importantly I`m me!!
I'm 27+6 and at night when I go to the restroom I tend to have pressure at the bottom of my abdomen and am scared to urinate.. I have my bi weekly exam coming up however, I am worried and don't want to call my doctor for nothing.. Any advice?!