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You do have an Araucana. Us American's don't tend to recognize the UK Araucana. In the United States the Araucana breed is tufted and rumpless. In the UK they have tails and crests.
That is a hen. A rooster would be crowing at that age, and would also be displaying nice shiny and pointed saddle and hackle feathers.
Not all breeds are mature and start laying at six months. Many wait until 7 - 8 months. I would keep an eye on your nesting box, those eggs should start coming soon.