Need help sexing plants

i looked at all the threads concerning this but none look like mine in the stage mine are in!
the nodes have a bunch of leaves that are closed up! i have the pre flowers and im in the 3rd day of the 12/12 schedule!

also how far into the 12/12 schedule will the plant start showing sex or flowers?

using a 2' t5 2 aero garden lights and 1 150 watt cfl

Don't look like they are sexing yet, looks more like the branches are starting to grow from crotch. Normal mine did same.

should i keep em in 12/12 schedule? or do they need to grow some more?

Well, if you have preflowers what do they look like? Are they a calyx with a white pistil, or a ball?

I couldn't exactly tell from the pics but it looks like it's a bit soon, keep em on 12/12 and you'll find out soon enough.

i thought the 2 little green hairs were pre flowers my bad ill keep em on schedule how long will it take until i know? i have what looks to be a set of leaves but they are closed up and have neved opened ill get better pics and up load tomorrow!
thanks for the help