INCUBATION OF BUTTON QUAIL! Is this egg viable?

[littlepip]

Hi!!!! I've been incubating button quail for 5 days so far, and MOST of my 17 eggs are starting to get little veins. I'm not so sure about this one though...

It looks like it has a dark patch, and if the incubation was further along this would be the chick, but that's clearly not a possibility since they're only 5 days along. or is it? Expert egg incubators unite!

 

[curious1969]

It appears to be cracked rather badly? I don't think it is growing though, my quail eggs tend to turn pinkish inside when candled if they are viable. This egg looks clear to me.