Dark spot on duck egg

[IAM1999]

Hey there,
I’ve got 2 duck eggs in my incubator, day 26. They both pipped yesterday (day 25) and where making noise and moving. One of the eggs developed a dark spot over night near the spot it pipped. Looks like a blood ring or something. Since this I have seen it move, but not as much as it did before. I’ll include a picture. Can anyone tell me what is going on? Never hatched duck eggs before. Thanks in advance!!

 

[IAM1999]

The picture:

 

[IAM1999]

Update: The other egg is still going strong, moving, making noise and just pipped a little more. No movement anymore in the egg with the dark spot. Did the duckling die?

 

[casportpony]

Update: The other egg is still going strong, moving, making noise and just pipped a little more. No movement anymore in the egg with the dark spot. Did the duckling die?

Welcome to BYC. Have you candled the one with the dark spot?

 

[IAM1999]

Welcome to BYC. Have you candled the one with the dark spot?

Thank you for the respons! I have candled it at day 8 and day 20. It was showing good development. And I have good news! Both of them hatched this night!

 

[IAM1999]

What I discovered this morning!

 

[IAM1999]

Update after almost a week