Safety of Estrogens in Lupus Erythematosus - National Assessment (SELENA) is a study to test whether women with systemic lupus erythematosus (SLE or lupus) can safely use estrogen. We will determine this by looking at the effects of oral contraceptives (birth control pills, also known as "the pill") on disease activity and severity in women with SLE. The results of the study will show whether it is safe for women with SLE to use the pill.