d’Uccle pullets or cockerels?

[CaliFarmsAR]

These guys are about 3-3 1/2 weeks old, so I know it will be hard to tell, but was hoping someone had a guess as I need a hen and rooster! Does anyone have a guess?
Any help is greatly appreciated!!!

Chick 2#

 

[nuthatched]

Too early, try again in a month.

 

[CaliFarmsAR]

Too early, try again in a month.

Yes I know, I was just hoping someone may have a slight idea