Hello and welcome to our family!
As lupus affects each of us differently, for some the fever does indicate a flare up. For others, the fever is a constant symptom. Usually, treatment for the underlying cause (i.e.- Lupus) helps to reduce the fever and the symptoms accompanying the fever. Prior to your visit with your Rheumatologist, keep a journal of sorts wherein you track your symptoms, what things/activities make them worse, what things/activities make you feel better. Also, list the questions that you'd like to ask during that visit. This will help you and your rheumy to determine what tests should be run, what medications should be tried, and what treatments should be applied.
In the meantime, we are here to help you as much as we can. I'm glad that you found us.
Peace and Blessings
Look For The Good and Praise It!