is this duck egg fertile?

[DuckEgg]

hello, i’ve recently come across an abandoned egg. i’m not sure what kind of egg this is, i believe it’s a duck egg? anyways, there was no nest, in fact, it was on top of the soil with nothing around. i’ve incubated it and this is day 7. i see no signs of life and would like some confirmation. the first picture i had taken on day 5 of having it and the second is day 7 (today) i am not sure how long the egg was outside before i took it in, however it looked similar to the first picture but lighter when i first brought it in. please help me out

 

[nuthatched]

Infertile, sorry.