Less urine output. Or is it just uti?

About 15 days ago,I had symptoms of urine infection,so I consulted with doctor,did urine test and had medicine. And it becomes normal. But again from 1or 2days I feel like I have less urine output , frequent urination without burning sensation. Less output in the morning also. My water intake is normal 3/3.5 ltr daily. I have no fever ,no pain yet. But I have mild  ankle swelling ( it's there from before almost 2,3 months) and mild puffy eyes. I have hypothyroidism also.I did my blood test 2,3 months back and all kidney function were showing normal and thyroid is also in control. Even urine test were also normal. I am confused and nervous if is there any kidney problems. Please someone tell me from my report if there is a possibility of kidney problem or is it just UTI? Note: # I took niftran 100mg for previous uti.            # Now my urine colour is very light yellow