Candling near hatching time

[Nestled Chickens]

I have an egg that I thought was going to hatch over the weekend. When I candled it, I could see a nice air space and then a dark mass. But can I tell if it is a chick or a rotten mass of nasty? I have no idea. What should it look like at this point?

 

[mulia24]

according to my experience ( 2 times hatching eggs ), it should look dark inside with only the air sack that can be seen. Some movement can also be seen, together with vein..

No problem at all, just leave it inside, there's no harm will happen if you just leave it. My suggestion, try to smell any bad odor, if you smell bad odor with an egg, toss that egg before it exploded..