Cayuga Egg - Bad Egg?

[sylvaniaduckmom]

Hello! My cayuga is currently sitting on 6 eggs. I keep checking every 2 days to make sure they’re all doing well. This egg has a lot of dark matter in it and it’s pretty hard to see. I’m pretty sure it’s a bad egg, but I figured I would get a few other opinions before ditching it, since I’m brand new to this. Thank you!

 

[Sussex19]

It does look like it's bad, although I'm not very good at candling eggs.