Mine just started turning red a week ago. three days ago it crowed three hours after sunrise. but since then she or it hasnt crowed. this morning no crow too.
If your chicken looked like the pullet in farmer boy's pic and then recently changed, then I would think a pullet. A week seems a short time for that much change, though. A cockerel will have the red comb and wattles by 12 weeks, but they will grow larger.
Did you check for saddle feathers? Look online for pics of Australorp roosters to compare, but remember, hatchery quality birds can look very different from breeder's stock.
I do not have enough experience with this particular breed to know for sure.
Still think you might have to wait a bit longer.
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