Unless your plants have 5 nodes i'd say its most likely to early to tell sex,wait it out till your plants grow out 5 sets of nodes then start watching closely,male plants allmost allways show sex first when sex is forced from 12/12.
Male pollen sacks will look like a minitaure banana & can be sticking straight up or pointing downwards,sometimes they group up like a bunch of bananas like you get from the store.