Soon to hatch egg question ?

[oliviaandjosh4]

This was one of 8 shipped eggs that I bought, all the others were empty duds & this is the only one that looked like it might be developing. I have just left it in my incubator and not really candled in a while but bc it is due to hatch by the end of this week I candled tonight & this is what I saw:

Does this look like an egg with a developed embryo inside? (I'm new to this in case you haven't figured it out lol) what is the dark blob close to the air cell?
I'm expecting this to be a dud bc the rest of the shipped eggs were so I will be surprised if it does hatch.

 

[oliviaandjosh4]

The lighting in the pic makes the egg look lighter than it is on inside it really does look dark and mostly full when I candle