A video would help. I suspect it's a different vocalization. A 13 week old pullet isn't going to crow.It's not loud at all! I don't know if it's because it's young and just working out it's voice box, or if it's a hen imitating a crow. I don't have a video, I just heard it for the first time yesterday after letting them out to forage, I'll try to get a video this evening. But I'm in such a tight knit neighborhood, I really cant' have a rooster. A single complaint could lose me all my chickens..