I must strongly disagree with the answer provided by the other expert. It appears that you are living in the USA, where Malaria is not found. Unless you have traveled to a tropical region of the world, this is not the problem.
There are many causes for fever including the common cold, influenza, urinary tract infections ("bladder infections"), respiratory infections including bronchitis and pneumonia.
Without any other major symptoms, it would be very reaonable and appropriate to call your physician in the morning OR to go to an urgent care clinic. A visit to the emergency room would be much more costly, time consuming and actually a much less reaonable option that a visit to your personal physician.