Back pain and UTI

Megan
I'm 17 weeks 5 days and about 5 days ago I went to an urgent care and they said I had a UTI, they gave me an antibiotic to take for a week and I honestly don't feel any better.  I'm having severe back pain and I don't know if it's caused by the UTI or something else.  I'm a worrier and I worry about everything.  Is everything okay or should I do something else?