Duck egg, day 13 - can see heart pounding

[Emiliesaspaas]

I want to start off with saying that i’m from Norway, and have found your forums to be extremely useful while I’ve been starting my career with chicken and ducks. I apologize for my bad english too, but right now I just have to ask if anyone has been in this situation.

I have runner ducks, and I have machinehatched many times the last year. Well, we are now on day 13 on this round, and I have been noticing something weird with one of the eggs.
Its growing day by day, but it looks like its the heart im seeing. Im used to being able to see it from early on, but this late?

What is it and what should I do? Wait and see?

Here is a clip from tonights candling:
https://www.kapwing.com/videos/683cab23cbfa0aad07083fe2

 

[Debbie292d]

Their heart at that stage is extremely small, about the size of a pinhead.

Perhaps it's like a baby in a womb that got a tickle on its foot? I would just wait it out though for sure! You'll find out when it hatches. That's pretty neat though!