I am a 32 year old male.  I began experiencing frequent/urgent urination last week.  I have no other symptoms and have no history of any urologic conditions.  I went to a walk-in clinic earlier this week.  They checked my blood sugar level and it was normal.  I was told there were nitrites present in my urine, but the lab results were negative for bacteria.  they originally thought it was a uti and i am taking cipro. i was told to continue. should i be concerned this might be something else?