I think you're good, because I'm pretty dang sure it's a pullet. Another thing, males usually have almost solid white heads, depending on the stock. There's a lot of brown on her head.
My SF cockerel at about 5 weeks for comparison. There's a tiny bit of brown and black on his head, but note...
I think it may be female. Males are usually completely black-breasted, and she has an awful lot of white. Sometimes hatchery pullets have a few dark feathers. Also, her beard appears to be coming in pretty white, and males generally have black beards as well as the black breast. That comb also...