Urine test vs blood test COMMENT PLEASE

Tarra

Hi everyone so I have been having pain in my stomach and back and recently been running fever , I feel like I have throw up constantly but nothing comes up ,

My last period was August 4th which ended the 7th .

The doctor gave me a urine test and it was negative & told me I just have a uti but I had plenty uti I never felt this way .

Do I need a blood test is it to soon for urine