Oh no! I hope she is not our he....all 6 of my birds came from supposed pullet runs (the man said 90% chance of being female) our white leghorn is the one with the biggest comb so far. I am going to be soooo upset if i have to get rid of her/him!! (I already have a good home if someone turns out to be a rooster.) I am going to be devastated.....I thought 2 weeks was too early to tell.
It depends upon the breed. Some are easy to distinguish early. Some like Swedish flower hens can keep you guessing from 6-12 weeks.