I honestly can't tell at this point. If you suspect it's a cockerel, you should probably start thinking about what you're going to do with him once he gets older. Do you want a cockerel? Are you allowed to have them in your area? If you don't want or can't keep a cockerel, your options are fairly limited. Euthanize it, or find it a new home. Maybe grow it out and put it in your freezer. Other than that, there's not much you can do.
I agree with harmony fowl. If his/her comb gets anymore red/pink I'm sorry to say but you might have a roo. Somthing tells me he is a cockerel(other than the comb) and that mixed with the comb probably means he is.