Dark spot on duck egg day 27

[rp riley]

There is a weird dark spot on this egg. It is on the big end where the air cell is and I am worried about it

 

[CaliFarmsAR]

Are the ducklings still moving? Are they making any noise? What breed are you hatching?

 

[CluckNDoodle]

When is your expected hatch day? Are you able to take a picture? If it looks kind of like a bruise on the egg I've seen people mention this happening and it seems to be related to where the duckling is pipped.