If this helps...
Here is my pullet AC at 9 weeks old - she hasn't laid an egg yet but she is definitely a she.
Thanks, Bobbie. Looks similar, still holding my breath. Well, OK, I'm not but I still have this "back of the mind' worry. Since the vent sexing process is supposed to be about 90% accurate, I fear the odds are not in my favor. Statistically speaking, I should end up with at least one roo, and none will be living at this house. Will have to find a home for one if we didn't get lucky, and it can't be Freezer Camp either. And, of course, by the time you figure out it is a roo, you have gotten sort of attached unless they have lousy temperament.
I am so happy! My beautiful AC finally laid her first egg! Yesterday I found a small white egg among my layers and wondered if it were possible that at the age of 55 weeks old she FINALLY laid her first.