Yogi ((big hugs)) You are NOT a failure. The strength and determination you have displayed for so long and so often is incredible, it is no wonder that you feel cheated. You deserve so much to have your dream come true and become a parent after all you have been through. Your little mite may well just be a real fighter and cross the line for you (My best IVF cylce yet happened with just the one little embie ferilising normally and a Day 2 transfer)
I don't pray every day but I will say a little prayer for you and your little embie tonight.