What to look for?

[ChickenMom04]

I’ve been incubating duck eggs under a broody Khaki Campbell. She’s 3 years old and randomly decided to sit on her eggs one day, which I only found out about when she didn’t come running to the pool one day like she usually does and then insisted on staying on her eggs. She’s been on her nest almost constantly but I have no idea how old the eggs are. I candled them and 2 out of the 5 seem to have a mass taking up half the inside that floats when I move the egg. It is quite dark but I haven’t been able to candle them in a completely dark room so I am unsure as to if there is a live baby moving or not. Out of the other 3, one appears to not be infertile but at the same time it’s no where close to as developed as the other two. It isn’t completely clear, the yolk appears to be large and red tinted which signifies there’s some sort of life that is either growing or did grow and then died. The last 2 seem infertile. Is my hen too domesticated to know how to hatch her eggs properly and how do I know if she’s doing a good job? Before I take the seemingly infertile eggs out, will SHE know if they are dead or infertile? Lastly, is it normal for an egg to be behind the others?

 

[Isadora]

I’ve been incubating duck eggs under a broody Khaki Campbell. She’s 3 years old and randomly decided to sit on her eggs one day, which I only found out about when she didn’t come running to the pool one day like she usually does and then insisted on staying on her eggs. She’s been on her nest almost constantly but I have no idea how old the eggs are. I candled them and 2 out of the 5 seem to have a mass taking up half the inside that floats when I move the egg. It is quite dark but I haven’t been able to candle them in a completely dark room so I am unsure as to if there is a live baby moving or not. Out of the other 3, one appears to not be infertile but at the same time it’s no where close to as developed as the other two. It isn’t completely clear, the yolk appears to be large and red tinted which signifies there’s some sort of life that is either growing or did grow and then died. The last 2 seem infertile. Is my hen too domesticated to know how to hatch her eggs properly and how do I know if she’s doing a good job? Before I take the seemingly infertile eggs out, will SHE know if they are dead or infertile? Lastly, is it normal for an egg to be behind the others?

Your duck unfortunately won't know whether her eggs are fertile or not.
It's pretty normal for eggs to be at different periods during because eggs are laid on different days and added to the clutch. Typically if people want their duck to hatch eggs, they will mark some of the eggs and remove any after that are added, that way they're at the same point in development.
Some ducks are good mom's, and some are not. She not "too domesticated" to hatch them herself, but whether or not she's a good mom remains to be seen.
I would suggest candling the eggs in a dark room, take pictures, and upload them here for people to give their opinion. I have only hatched goose eggs once, and they were hard to see due to the thick shell so I'm not as experienced.