UTI after postpartum sex

Ugh! So just had sex for the first time the other day since the birth of my child and now I have a UTI! I’m so aggravated and now I have to wait till tomorrow to call my Dr and hope he just calls a prescription in for me. Any advice to get me thru the night?! I feel like I have to pee but nothing really coming out. I have a heating pad on and took Tylenol.