Hi, I am currently incubating three duck eggs. I am on day 10. I keep trying to Google pictures of what I shouldn't/should be seeing. Nothing is exactly helping. The 2 out of 3 eggs in the incubator do have something inside. If the egg is fertile, should it be pretty dark on just one side? I move the egg and I can see the dark part moving but that's about it. The other egg doesn't have the dark part. Any recommendations or advice?