Double embryo duck egg?

[HonkABC]

This evening, I was candling and saw two embryos, moving one after the other. Is this even possible? The egg was not a double yolk.

 

[BelovedBirds]

This evening, I was candling and saw two embryos, moving one after the other. Is this even possible? The egg was not a double yolk.

I believe you are seeing one embryo, they can look confusing at this stage