Dansta. how long do you think the hen has been sitting on them? Cause they sound fertile to me, and probably over 14 days. either that, or they are rotten. LOL
If you candle an egg for long enough, like 30 seconds or more, frome the air sack end or even side on, you should be able to see the chick move.
Try it on your whitest eggs, they are the easiest ones to see into.
How many are fertile? Do they all appear to be around the same gestation, or are some noticably smaller?

