Who layed this egg?

[Jax12Ts]

My chickens just hit the age where they are laying eggs, when I found the first eggs I didn't exactly know who it came from ( like the breed not the exact chicken). This is a problem I have in countered since I have multiple breeds in the same coop. It looks small like a silkie egg, but it has a green tint, which I know ameracanas/Easter eggers lay, and I have both a silkie and I have two Americanas (confirmed they are both hens). Any info on this?

 

[Poultry parent]

Ameraucanas. Pullets that are just starting to lay usually let smallish eggs at first