Dogs average a body temperature of about 102. You should keep taking your dogs temperature and note any increase or severe decrease in temperature. If the dog's nose is wet, you should take them to your local veterinarian.
Average temperature's have a wide range in all animals and dogs are no exception. Their range generally can be from 92 degrees Fahrenheit to 102 degrees Fahrenheit. What's important here is if the dog is behaving any differently. Often times behavior changes are a better indication of illness than temperature readings.
Yes, you should be more than worried. Dogs are naturally hot natured but anytime a dog is running more than a degree over average tempature it is time to see the vet! Your pit bull could die if not treated properly!
A dogs rectal temperature is normally 100. 5-102. 5. Their ear temperature is usually between 100-103. This means that you should not be worried. A slight fever is normal.