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.