When is the earliest signs of sex come into play?

When is the earliest that my plants will show their sex? Do they usually show during flowering or is there any way that they will show during veg.? I need some advice on this and what is the best way to tell the difference between male and female?

you can clone one them and put it on 12/12 in the veggie room and if it has balls. its a male obviously. if not its a female

Ak bong rippa said:

you can clone one them and put it on 12/12 in the veggie room and if it has balls. its a male obviously. if not its a female

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well i got six plants and they are 4 1/2 weeks old, is that too earlier to be showing signs of sex?