I would say that you need to read up about growing quickly. The plant right now is in vegative stage i presume (18 hours of light a day), when you put it on 12 hours of light a day(flowering cycle) it will show signs of either being a male or a female, or both(a hermie). I would suggest wait until the plant is atleast 12 inches big before you put it in 12/12. What lights have you got, what is your setup?,are you using nutes, we would love to know more.
Hope this helps, but ultimately you need to read up about growing as much as you can. It will help alot.