My Setup

LOL.....that is some nice looking male....don't worry there is always the "next time"....

You did well. That's a healthy plant.
Sadly, you were sabotaged by that pesky Y chromosome...

I have some questions:
Where did you get those seeds? They were sold as 'feminized', correct?
What type of light did you have the seedlings under when they FIRST sprouted?
Did you notice the temperature during the seedling stage to be out of range? If so, in what direction?