I can understand your concern with the health aspect of it, but I have to say I don't think I would mind multiples at this point. With my age, and good health, for the first attempt they don't see any reason to transfer more than one. If this try doesn't take, then we might be possibly talking transfering 2 next time.
I am sure it would be overwhelming to have multiples my first time out the gate being a mom and all, but we have talked about it already and know it could be a possibility - We'll see what happens....
Good Luck!!!!!!!!