is it dead

This egg is 13 days old. I checked on it 2 days ago and it was moving. Now the blood ring seems stuck to the shell and I can't see the embryo anymore. Is it dead? Or is this normal for this stage of development?

Hi there. I'm attempting to hatch some chicken eggs currently and I have some questions. I just candled my 8 day old egg and it's looking like it should for that stage of development. Only issue, the veins and embryo in the center are not rotating/floating with the egg when I turn it, they seem...