Can I tell sex at 11 weeks?

[swimmer]

I have four 11 week old pullets. I was told they were all female when I bought them at 7 weeks. Is there any way to tell if they are roosters? Feathers, combs. Can't have roosters, so just want to be able to tell asap. If that is possible. I have a Wellsummer, Speckled Sussex, White Rock and a EE. Love these birds, hope none of them have to leave.

 

[SpringChickens]

Post pics, people here will give you an educated guess!

 

[cpegram]

post some pics then i am sure you will get some help

 

[swimmer]

Will post later. Dark out at the moment.