Omelet, is Omelman. Its a rooster. Even at 10 weeks, that is a huge comb. The wattles not only are they growing, but they are red. The comb on a hen, won't get that red until right before she start to lay.
I am sorry you are disappointed. It happens to everyone, and the person you got him from might not of known either, or they did??????
No, I don't think she did. I've had hens before, and they had pretty small combs. But the fully grown hens she had had HUGE combs, so that kind of threw me off. Also, i was just so excited to finally be getting chickens again all logic flew out the door, along with the little knowledge I had of sexing.