Yesterday was day 10 for our duck eggs so we quickly candled our 2 clears to verify that they were still clear and they were. Before tossing them out I opened them up to check what if anything was going on in them. One had a fully intact yolk with a tiny white ring on it, is that considered to be the bullseye that signifies fertility? The second egg yolk looked like someone had vigorously shaken it and it had some light yellow creamy swirl in it with a tiny spot of blood. I am guessing the blood means that the egg at least started but does the liquid yolk with creamy swirl mean it was rotting or is that normal for a developing egg that quit?