Looks good man, nice big healthy fan leaves, though i did notice that some of them have light tips.
If I was you id head down your local gardening store and get a PH meter, then first of all test your water (without nutrients), then your soil. Cannabis needs to have a ph of 6-7 (i believe?).
Apart from that looks like a really nice grow, but without giving us more details we cant advise anything, so what lights, soil, nutrients, light schedule are you using?
The sex of the plants will become much more aparant in a week or so, later in the flowering stage, and if your stil not sure upload some close-up pics on here.
b0urner :P