Welcome to the site. There are a lot of nice folks that come in here and they have a lot of good information.
I don't know if a pregnancy could trigger the auto-immune disorder or not. I know that stress sure can big time. It sounds like you are sun sensitive and that would go along with Lupus. You need to write down all of your symptoms and everything that you can remember through your life when you go to the Rheumatologist. It would be great to have someone else there with you, so that you can ask questions and maybe they could be your support system. I hope that you get some answers when you see the Rheumatologist. Please keep posting ok.
Lupus for many years. Like most of my life. Sjogrens that started at 35 and Scoliosis, Spinal Stenosis, Degenerative Disc Disease, Osteo-Arthritis of the spine, Ankylosing Spondilitis, Periferal Neuropathy, mild CP and now just recently diagnosed with PA. I had a disc replaced in December of 2007.
Plaquenil, Sulindac, Imuran, Celiac diet, Tramadol and B12 shot once a month.