Dark Brahma roo or pullet

[Gemlan10]

Hello
I have 3 dark Brahma chicks 6 weeks old and I’m wondering if they’re Roos or pullets. First time chicken mama

 

[nchls school]

Look to be all pullets.

 

[Gray Farms]

First and third pics are cockerels. Second pic is a pullet.

 

[Gemlan10]

First and third pics are cockerels. Second pic is a pullet.

That’s what I’m worried about