So sick today after being in the ER last night.

I went to a doctor lastnight because I had a fever, pelvic pain, and nausea. Turns out I have a UTI so he put me on antibiotics. I have to take them twice a day. I started them last night and also took one this morning. I am so much worse today than yesterday. I am having a hard time even getting out of bed I'm so tired. Could this be the antibiotics or my body just fighting the infection? I'm allergic to a few meds so I just don't know. Should I call my doctor in the morning if it's still bad?