I agree, you have a pullet. I have two Marans pullets with very similar combs at 5 weeks!

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It would be amazing to have a girl! However that tail, untill like 3 weeks there was no tail at all so it did grow a lot and its been really double since day one, like no fighting small comb and loves to sleep and cuddle. But also very adventurous and that late tail. Also his (always say he) wings were a lot smaller than the othersPretty sure pullet- the very small and yellow comb at five weeks is why from my POV. Definitely a 'hold' though- would like to see more tail and complete overall feathering at this age! Fingers crossed you've got a pullet!