I'm new to all of this egg incubating and hatching so I may be posting a lot of questions lol. But a little back story is we inherited a few chickens from my MIL. Turns out our rooster is a silver laced wydontta and the hen to this egg is a red sex link. We decided to get an incubator from a friend and see if we could hatch a few since we only have 4 chickens, one who thinks he's a dog to really only 3 that produce, and get a few more. We have 7 eggs and one looks like a dud but when I candled this one to see if it was fertile I found this. This is day 7 and it does have veins but it also has this spot. It's the only one that has it. Any clues as to what it is? I've been turning them by hand 3 times a day so I'm afraid I may of bumped it and a vessel busted.