Can't determine sex of plants

Hey guys complete noob here I'm on my first grow almost at week 4 of veg. I know this is probably a stupid question but I've heard you can start determining the sex of plants at 3-4 weeks but my plants are only growing new leaves between the nodes rather than showing any signs of sex. I know its still early days but I'm just not sure how ill be able to tell the gender of the plants if theres leaves between the nodes. Any advice would be much appreciated thanks in advance

Still kinda of young to show sex normally see pretty flowers between week 5 & 7 but that's all strain dependant

*pre flowers not pretty flowers lol

Ya gotta get in there nice and close to see sex.

To soon