My experience with duck eggs is that they are hardy little guys. Make sure your temp is correct and keep humidity at the proper level. Any idea how long they have been growing? If they are only a week or so in, I would make sure to keep them in the turner; otherwise, the yolk will separate. Remember also, duck eggs take longer to incubate than chicken eggs. Depending on the breed of duck, can be up to 28 days.
You are a good mama hen for saving the eggs!!
You are a good mama hen for saving the eggs!!