uti symptoms but so far urine tests came back negative

Heather
So. I swear every other week I start getting uti symptoms. Sometimes burning. But usually just the peeing ALL the time. 3? Weeks ago dr tested my urine at lab at hospital. Came back clear I believe. But it was over the weekend so she called me in antibitoics. Felt better. Now a week or 2 later after meds symptoms are back. My back hurts too- has since Sunday night. Sometimes middle and upper. Sometimes lower. Sometimes all over. No fever
Idk if I should call dr and ask again or if it's just where baby is sitting or if it's even yeast infection from antibiotics ?(sometimes my back hurts w those) 
Anyone else have the symptoms without a uti / test clear ???