Exercise with prolapse womb?

I have been diagnosed with prolapse womb and am waiting for consultation with gyny. I'm 40 and have one daughter who is now 14. I cant understand why this has happened and my gp cant give me a reason. I regularly attended spin & pilates cles but am unsure if these exercises will worsen my condition. Can anyone shed any light on this for me because the last thing i want is to feel anymore uncomfortable than i already am. Any advice would be really appreciated......thanks