Hi doc, I'm 23 female, I don't know if I have early stages of kidney stone or UTI. Symptoms: - Fishy odor urine 3 weeks back (that was the first and last time). - odorless clear urine - no cramps or pain in abdomen - no burning sensation during urination - no blood in urine - at times I sudden back pain at left side (not severe) - but today (7.12.18) I felt a severe pain in urethra with frequent tendency to urinate. Neither blood, odor, or fever is detected.