I have two hens and 1 rooster that has been covering both. The mixed easter egger type hen I know is laying fertile eggs but the Red Star hen's first few eggs didn't look fertile to me and I am still on the fence about whether her most recent eggs are fertile. Pictured is one of her double yolk eggs(that I didn't want to hatch anyway for that reason).
What are your opinions?

Here is a picture of what I think is an obviously fertile egg from my other hen:

What are your opinions?
Here is a picture of what I think is an obviously fertile egg from my other hen: