To tell you the sex of the plant, you need to show us a picture where we can see the spot where a leaf comes out of the stem.
If you find (a) white hair(s) it is female, if you find little balls it is a male.
But to see these the plant should be in flower. If it is a automatic plant the first sex-indicators will come after 4 to 5 weeks, for photperiodic plants it will be 1-2 weeks after they get less than 14 hours light a day. If photoperiodic plants have a long vegetative stage, they show up with some sex-indicators before they flower (I would say after 3 months of veg, but that might be different from cultivar to cultivar).