The thing is it's open now for germs to get in. There are veins in the membrane and that's what you're seeing, so the membrane tore a little. You might save this egg. You can do this!
I have never done either, but I've heard of people melting a color crayon or candle wax and putting a fine bead over the crack. I've also heard of people using fingernail polish to seal the crack, but I'd worry some of that could leak into the egg since you're seeing blood. I'd maybe go with...