Its gonna take a little longer than the normal couple weeks for that plant to show sex. Its not mature yet. Given time it will flower as long as you are doing 12/12 lighting. From seedling most people will wait til the nodes alternate before flowering. Now with clones you can flower at just about anytime cause they are the same age as the mother plant. Just a suggestion, but you might want to have one plant per pot. Youre just asking for problems with multiple plants in a single pot. Good luck