I have a hen that has been sitting on one egg for about at least a week.. today she left it and started sitting in another nest on another egg .. It is a brown egg and I did the light to see inside and I can see the yolk at the bottom it moves a little.. the rest of the egg has dark spots in it but I can not tell if it the start of a chick or just a bad egg ... I have watched a ton of vidieo's and none of them really helped.. The dark areas in the egg look like veins but I can not see any movement.. it might just be bacause the egg is a little cool.. it was not frozen but it was not as warm as it needed to be.. Does the vain look inside the egg part of the egg going bad or does it mean that the egg is still trying to fight? any help would be great..