Recurrent pregnancy loss

Hi,
I have RPL, and have 4 miscarriages this last year. Now done IVF with 13 eggs, 11 fertilized and only 2 made blasto at day 6. I have RA, mild endo. I take enbrel 50 mg 1xw and my ivf doctor now has me on 10mg prednisone. I had to freeze both embryo and are waiting on FET. I have been on prednison for 50 days. Is the dose ok, or should it in your experience be increased. Is there anything else that I dhould think about and discuss with my doctor? Is my chances ok? Given that it made to blasto day 6 instead of day 5?