What went wrong

[Jefe]

I tried my first batch of eggs and had no success. I only started with 4 eggs 2 of them were not fertile. After 27days I decided to check, I cracked them open and 2 had growth but were dead now the fluid looked blackish and both had large yokes attached still. What did I do wrong? Incubator is made for 7 eggs, and was set to 38C = 100.4 F

 

[BurntFeather]

I do not know exactly what went wrong, but not every fertile egg will become a perfect baby chick. I am sorry that it didn't result in healthy baby chicks.