I cannot answer your question but I will tell you if you are thinking of pregnancy get a good opinion on this one. I have only one too and my pregnancy was hell. I went thru a year and a half after with a nephrostomy tube bag on my leg until I found a Dr. who could even find the problem and fix it. Not trying to scare you but I almost lost my life and my child's. Happy to say we are healthy today and enjoying being a mother. I would not trust anyone other than a kidney specialist and if you need the name of one I can recommend the best in the country. He save my life when all the others sat and scratched their heads.