too young to tell sex yet.. and like someone else has said, you can't tell sex of a plant by the smell it gives off.. also, different plants, even from the same seed stock, meaning the same strain, can give off very different smells as one can take more after the mother and one can take after more of the father and exhibit traits of each, smell being just one of many..
once it gets older and starts to get near sexual maturity, usually around 2 months or so from seed, you'll notice the branches will start to alternate instead of being in the xmas tree shape they were up till this point, and you'll start to notice pre-flowers usually about 1/3rd or so wat down the plant from the top.. this is when you'll be able to determine the sex of your plants.