Can u determine sex after 2 weeks of vegetation

HI, I'm two weeks into veg. started from bag seeds and growing in a hydroponic chamber. It's almost time to move plants to flowering side of chamber and I need a mother. What is a good way to determine which of my plants are female. ty

wait till they show pre flowers.. 2 weeks is not nearly enough time.. it took mine almost 8 weeks to show sex.. depends on strain.. but the best bet is to just put them into flowering when your ready to and in about a week after changing the light schedule u should see them

it will probably take 12/12 to show sex

Would I be able to go back to veg. after I start to flowering.

why not grow the plants big, take clones off after some time..keep girls then toss out males