My heart goes out to you, as I know what you are going through. I miscarried between Jessica and Andrew. I know it is hard, and I know that you are grieving, and you are mad, and asking why. I felt the same emotions, however, I did learn one thing and I truly believe this, that everything happens for a reason, and right now it is hard to see why this happened, but in time you will see that everything will be okay.
I am also a birth mother, (I gave a child up at 17), and the woman who became the mother of my child had suffered many miscarriages, and she had kept asking herself why. She later understood, that she was not supposed to be the mother to those children, she was to be a mother to my daughter, and she is a wonderful mother. All will be okay, you will see.