Looking at the way the crest is coming in im leaning towards boy, and the reddening of the waddles. I don't know when polish get their red waddles and such but I do know that in general, chicks shouldn't his early. what is the behavior like? Its kinda a long run cause I have 2 cochin silkie mix Roosters and they have red waddles and combs and I think they are 4-6 weeks. Their behavior is like the usual rooster, on even tried to fight my shoes. But despite the way they act one is barred with female barring (female vs. male barring is different).
I also have a Serama that acts like a female, is extremely passive and is playful, and if I didn't know any better I would think its a female. but it has a red comb and waddles and is the same age as the other roosters.
All chickens act differently, but I do believe you got a rooster there. I hope where you live you can keep him cause he's beautiful.