I don't think you should necessarily expect it, or if you just had what I just happened, you would make no assumptions about sex either. A 4-month old silkie I'm positive is a cockerel, just squatted in front of the coop as I was standing there to make sure they went in. I started petting him and he squatted down just like a hen. (They're being acclimated to a new coop from where they were.)
I've had a few of my hens squat, and we have a few roosters. But I wouldn't think anything one way or the other personally.