It sure looks like a pullet to me, but if it was crowing, it is likely a cockeral. Campines do develop quickly and crow early, but the cocks usually get a prominant comb pretty fast. I am so jealous that you may have a pullet! If I had known it was a girl, I would have hatched it myself! JK! Please, please, PLEASE keep the pics coming so I can see what I can expect from that pair this fall. I guess the other didn't hatch? I sent you two SC eggs, right?