Yes, some chronic diseases will often present low WBC counts. The condition is called neutropenia. I have it. My WBC count fluctuates with the disease process. I have times when it's low, like you, and then other times when it's perfectly normal. All depends on how active your lupus is.
I would keep continue seeing your rheumy and keep that diary of symptoms,etc. Lupus is such a pain in the you-know-what. It will present symptoms and then all of a sudden not present any. If you feel uncomfortable with your rheumy, you need to see someone else.
I can do anything through Jesus Christ who strengthens me. I have learned in whatever state I am in,to be content. Phillipians 4:11-13
34 years old. Diagnosed with lupus in 2000. Fibromyalgia, anti-phospholipid syndrome(APS)(stroke),Sjogren's, Raynaud's, seizure disorder-(miraclulously disappeared!), Libman Sach's Endocarditis, vasculitis, sacroiliitis, arthritis (neck) . Prednisone, Imuran, Coumadin, Clobazam, Amitriptyline, didrocal, Cozaar, calcium, Cykolokapron, multi-vitamin, vitamin D, Magnesium, vitamin B6, Acidophilus