About how tall is plant and how many nodes? If 5 or 6 nodes, I would top back to 3rd. Once new growth is established, I'd try to find out sex. Now I have never done this but even Nebula has some info in one of her tutorials. Place plant under 12/12 just long enough to show sex and then quickly revert back to veg. Or if it is the only plant you have and you don't mind spending the time and effort, continue to train plant as if its a girl, and after 12/12 flip you will find out if all your hard work paid off and gave you a girl.