it shouldnt have any effect on wether they turn out to be female or male.
a gallon size pot should be plenty of room for them for about 3-4 more weeks then you should think about transplanting to a larger pot or in the ground if its an outside grow, however you can transplant earlier if you needed to move them to a grow spot you may want to take smaller plants for ease of moving them but would probably give them atleast another 2 to 4 weeks to grow before transplanting.