Early sex determination?

I am currently three weeks into my first grow, and hoping that at least one of my three plants is female. I have a good understanding of how to determine if the plants are male or female depending on whether they grow hairs or balls where the nodes branch from the stem, but i recently saw a post where someone said that they could tell their plant was a female as a seedling. So my question is, aside from having feminized seeds or a clone, is there any way that you can determine gender before the plant enters the flowering stage?
 
i heard that if you veg them long enough they will show their sex. i dont know how long though.
 
It'll show before flower...check the sexing chart in my sig link... Luck.

haha thanks twistyman, ive already ready through your charts, they are very helpful! id say ive gotten like 40% of my growing knowledge from the link in your signature already haha. Thanks for the help
 
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