You should just be calm. Worrying makes things look what they are not. Making yourself anxious makes you feel like things will just not go the way you planned. I am sorry for the miscarriages and the down syndrome. Hoping that you found a solution to the problem. Concerning the miscarriages it could have been better if you exactly knew what the problem was. Nothing happens accidentally in the field of medicine. There must be forces behind. So now that you got a good doctor. Let her or him explain more on the scenario. I would have helped with some reasons here. But then I feel thus is nit the best platform. And i9t ill not be the answer to the question you asked. But I think the solution will be found by tracking where things went wrong. Then thereafter you will find the way of solving the problem.