I use the Mirena IUD - it is not copper and is good for 5 years. I get a new one in February. IUDs are actually the most common form of birth control in the world. It's not as common in the US as in Europe due to some problems with the old copper ones in the 70s. Usually doctors suggest an IUD after a first live birth because the uterus has been stretched and it is more comfortable to insert. IUD stands for Intra Uterine Device - it is a little device that is in the shape of a T that is inserted into the uterus through your vagina. The Mirena I use also releases a small amount of Progesterone. I'm sure there is a lot of info on the internet if you are interested.
Ooops! Also forgot to mention that I've been on Cellcept with out being on steroids, too. You can use steroids to manage smaller flare issues while the Cellcept manages the larger problem.