Seed gender is very tricky. There is no way to determine what a seed will be, male or female. Science has shown that a high Nit. and Pott. while in veg and seed growing stage will increase the likelihood of female seeds, but there is no way to actually tell what seed will do or become. females will produce both male and female, hermi's are almost always do to stress, messing with their light cycle (never interrupt dark time) is good way to make your plants herm out on ya.