Determining sexes

Will I be able to tell the sexes of my plants in the 2nd-3rd month of growth? Also, where should I look and what should I look for to determine this. I've looked at guides to flowering, but they haven't really explained it well to me.

Look for the preflowers...

GROWFAQ

you need to look for preflowers, the plant gets ready for its babies kinda like a human does......at the internodes, just behind the stipule at around the forth week of veg (i've seen it 2 weeks after germination) there will be ethier a small sack thats sealed and round(male) or an oblonged non-sealed sack with 2 little hairs coming forth from it(female).

internode: where the branches grow.
stipule: where the leaf comes off the main stem at an internode.

Female:http://www.drugs-forum.com/growfaq/1037_files/itof0000.jpg
Male: http://www.gardenscure.com/420/attachments/growth/124603d1141678942-sexing-male-female-pre-flowers-dscn1821.jpg

just look at some of the nodes at the top of a plant, if their showing little green balls uproot them or your buds will have seeds.

I'm having a hard time telling the difference between the plants, I took some shitty ass pictures maybe you guys can give me a hand. Sorry about the low quality, its a pos camera. I can take more pictures if need be, I was just in a hurry.

Going to take a magnifying glass to em tomorrow, I'll keep you all updated if you want

This looks female to me, though I would like a second opinion from one of you all

looks to early and blury to tell. Try and get a clear close up shot of the very top nodes and we might be able to help.

These are 2 tops of the plants I suspect are female. I see like 5-6 white hairs coming off the top, though it may be a little hard to tell from this angle.