okay lets put it like this from seed to sprout 1 to 2waeeks veg stat up to 2months you wont be able to sex till you alternating nodes on plant meaning when the leaves start coming in on the alternating branchs a plant has to be fully mature to tell you can force a plant to flower. what happens is cover the plant every day at 7pm and by 9 am the next uncover it dso this for a couple nights and you should start to see something . if i read right its only 3 weeks old you have awhile to go yet.