Swollen nodes? Did you get kicked in the nodes? Ouch! Sorry to hear that.

Seriously though, how long have you been vegging for? When your talking pre-flowers, its just a time game. There really is no way to know what is what till the pistils come out or the ball clusters start to become obvious.

Sometimes males will be much more vigorous than the females within a given strain, but ya still never know till the pistils come out.