Day 6 and I candled. 4 Eggs have beautiful veining. 2 eggs have this oval, elongated dark mass. and 1 egg has the black dot, like an eye. In the 2 oval elongated type, am I seeing a chick? They are brown eggs, I couldn't make out any veining. But that mass was moving.
From how you have described it I would say yes they are embryos in the two eggs. Especially if you have seen movement. Dark eggs you can't sometimes see the veins as at day 6 they are still quite small and just getting established. I would leave the eggs in and when you candle again hopefully the veins will have got stronger and larger and you will be able to see them. Also you should see the embryo developing in size and the air cell growing. Wishing you the best of luck with these eggs