So, I bought some call duck eggs and had them shipped a couple weeks ago, and they're on day 18 of incubation. Everything has been going ok, but I looked at the eggs last night and one seems so much more developed than the other. (I only have two developing, so sad!) I can't see any free space in one egg and it looks like its ready for lockdown and hatching. This can't be possible though, they still have a week before hatching. The other one is still growing and moving around but there is still veins and emptiness in the egg, as I expect there should be this early in incubation. I can't tell if the larger one is moving or not because the only light that gets through is in the air cell. What should I do? Is this normal? I can post pictures if need be.