Question on candling

[SnowyChickenMomma]

I have some eggs from March 30th today is the 18th day. Two days ago I candled them just to see how they were doing and I saw a lot of growth and I could see almost a full grown in chick but when you move the egg from side-to-side the embryo inside moves as well is that a good sign or does that mean it's dead? By moving I mean it's not wiggling it's just floating around in there kind of makes me think it's dead what do you think?

 

[AltonaAcres]

If it is dead, you would see no veining and just black shadows, not dark, black. you would know. When the chicks are that big towards the end of incubation they really can't move they are so cramped.