Girls, my daughter has been sick since Thursday night. For three days …

Girls, my daughter has been sick since Thursday night. For three days it was 39-39.5 degrees Celsius with no symptoms. Yesterday and today it's 37-37.5. I thought about taking tests this morning but the temperature wasn't high and after lunch nap again shows 37.5. Now I think should I take the test or not? Maybe bacterial infection or viral? Her throat is red. The child is active and eats everything. She is two years old.