Um, I think you got that backwards. Rounded hackle (neck) and saddle (base of tail) feathers= hen, stringy or pointy hackle and saddle feathers= roo.
But, at 6 weeks old, this bird is still to young to check those areas. Right now, its plumage says pullet. With Easter Eggers (which are typically Ameraucana mixes, usually), that penciling throughout is a female trait. What you should look for, as far as male indicators that will pop up first, are vibrant red/rust patches. They usually appear on the wings first.
Are you sure your chick is an Ameraucana/Araucana mix? I ask because your chick appears to have a single comb. Both of the breeds mentioned have pea combs, which is dominant, which would mean your chick would get a pea comb if those breeds were its parents...
