Could my lupus be leukemia?

I have been diagnosed with lupus for 3 years. I take prednisone because nothing else really works for me. My new doctor just called me after a new blood test telling me that my white blood cell count is very low. I say I know, it always is. I am told that since I am on the prednisone, my white blood cell count should have gone back up and not stayed so low. After some internet research I see that leukemia CAN be mistaken as lupus, but nothing is completely straightforward. Now I am all worried, do I have any basis for worrying that I could have leukemia?