Hi, Barbara. In your shoes, I'd want my OB/GYN to be highly conversant with lupus, maybe one recommended by your rheumie & who will work hand-in-hand with your rheumie.
And like Georgie says, maybe there are reasons for your irregularity in addition to lupus? e.g., steroids. What med(s) are you taking?
Have read widely yet? Dr. Wallace devotes a full chapter in his hardcover; he covers the autoantibodies & the pre-existing issues that pose special risks. I'm sure Dr. Lahita also covers the subject thoroughly (I lent my copy & never got it back.) Also, you could find a lot of credible info by browsing (for example, the SEARCH BOX in the upper left).
I'm glad to see how young you are (you whippersnapper, you!
). I know you never wanted these fears at any age, but hopefully your knowing & getting the best medical treatment available can make all the difference. WISHING YOU THE VERY BEST, Vee