Given your symptoms, the only way to rule out a UTI is by doing a urine routine and microscopy and a urine culture and sensitivity. It cannot be ruled out conclusively by a clinical examination. In all probability, yeast infection would refer to a Candida infection. This would not usually cause symptoms like the one you are describing. I would suggest you see your primary care
physician and get the above mentioned investigations done. We'll then know the best way forward.