Last Thursday my class and I put 24 Pekin duck eggs in the incubator. I have an automatic egg turner, the temperature and humidity has been triple checked every day and I cannot tell if they are fertile or not. I have done this before but with different kinds of ducks. We are on Day 5 and I feel like I should be seeing clear veins and I do not. How is it that all of them are not fertile? Am I checking too soon?? Thanks!