I've Been Having Fever And Chills 3x But I've Been

I've been having fever and chills 3x but I've been okay for 4 days after that so I thought I was fine. Last night it started again out of nowhere so I went to the doctor this morning. Nothing hurts so he can't pinpoint what's wrong with me and just told me it might be UTI. I've had that twice before (diff doctor prescribed me cefuroxime that time) but I told him I don't have the symptoms this time. Like frequent urination or burning sensation when peeing. Nevertheless I said I'd get a urinalysis to check. He said no need and automatically prescribed me the same antibiotics. Should I start taking it or get a urinalysis first?