To early to tell just yet... If you'd have not topped them, they'd probably be showing.. =) That's why I hate messing with them at all, until I know for sure that they are female. That way I don't put my hopes and dreams into something that I am going to end up cutting down because it's a male......
Not saying that topping is a bad thing, or that you did it wrong, not at all, I just have my own preference of waiting. =)
Nice plant by the way, I am hoping it is female, it has the look of one, nice short fat stumpy, internode spacing is short... let's hope! Always at this point my wife goes and sweet talks them in to being females.. Give it a try. =)