Is your humidity up? My duck eggs started hatching at day 26 but hatched up to day 30. Many of mine did not move much right before they hatched and the duck membrane is tough to get through. Next time I am going to spray water on the eggs and put the humidity up to 75% to 80% since about half were shrink-wrapped. I did have more than 1/2 hatch with 100% fertility. good luck and give it some time.