I would say pullet. The roo is going to be much lighter. Almost gray with a little black, whereas the hen will be black with a little gray. Here is my 4 week old roo
And here is one of my hens
I bought 18 from there a few years ago. 4 each from 4 different breeds and 2 silkies.. They all were similar in age (7-10 weeks) and the employee methodically got each bird by hand and managed to get all hens just like I requested.. All birds were healthy and happy until my dogs got them last...