I don't know much about it but I do know that pregnancy is suppose to some what/how "cure" it for the time being.
Its very weird to me and not sure how it happens or works.
My Aunt has Lupus very badly and has since she was a teenager. She wouldn't marry my uncle for a long time because of it and because she though she couldn't have kids.
She had 2 wonderful boys and during her pregnancies she was completely healthy.