As long as there is no burning sensation while urinating, no fever, no pain, there is nothing to worry. No emergency as such. Before your next visit to your Dr, you can get a urine examination done to see if there is actually any problem. If there are pus cells in urine, even if you don't have symptoms, it's better to get treated for it, since infection anywhere in the body is a risk factor for preterm delivery. BUT DONT BE SCARED. Your dr will do the needful when you show the report.