Unfortunately, there is no predicting how Lupus and your body get along. It is called the disease of 10,000 faces as it is rare to have the same thing happen with any two people.
Generally a rheumy will put you on Plaquenil, an anti-malaria med which oddly enough seems to slow progression of the disease. Your rheumy may be waiting till after the prednisone addresses the inflammation to start this. Otherwise, the symptoms are treated as they arise -- and you may never have more symptoms than you do now!
ANA and antibody tests do not "prove" Lupus, nothing really does. They indicate an autoimmune disease, there are several. The symptoms and how your body reacts to treatment are strong factors contributing to a proper diagnosis.
Try not to stress! I know that's easier said than done, but stress has a way of increasing disease symptoms. Otherwise, do the general things one is advised for good health: eat regular balanced meals (drink water), get deep restorative sleep, and get 15+ minutes of exercise a day. (This may be dancing to your music! lol)
Again, there is no way to predict or avoid organ damage, scleroderma, RA, disfigurement, etc. But you have been treated early and are on the lookout for increasing symptoms. Most rheumy's, even with mild cases, want to check on you every few months.
Hope this helps, also check out www.lupus.org
Lynnwood, Lupus & Sjogren's Moderator, Dx: 2002DIAGNOSING LUPUS & LUPUS RESOURCES
"Life is far too important to be taken seriously." - Oscar Wilde