Ok. If it was me, and yes, this has happens several times to me, if I knew my temps were off, even slightly (1° high) I would put baby and egg in a cup. You want the baby in a "C" shape. Kinda fetal position. It puts pressure on abdominal area to help yolk contract in. If I felt, and could see no yolk,I would leave baby as is. Let baby hatch out. Are there still veins showing on membrane? Ones that are slightly smaller than a pencil lead, or, small spidery hair veins? If large ones, cup. If small spidery hair veins, I would allow the hatch. Using a qtip to stop bleeding. I also keep a tube of bacitracin in the bator. It keeps it very warm and liquidy (easier to spread.)
What are you seeing at this point?
That goo yellowy white slime isn't yolk.