best way to sex plants for a newbie

This is my second grow. My first was more of a gorilla grow, now im trying to do it right.... hopefully with some help from u guys. Ive sprouted planted and repotted the seeds I bought. As of now my seedlings are 24 days old from seed and doing great. I belive my next step is to sex them cause I didnt buy feminized seeds. Is it ok to sex the entire plant then put it back in veg once I know what it is or should I take cuttings and sex those. Thanks.

They show sex at maturity if you keep vegging.

Just wait a couple more weeks, they will show you what they are.

forgot to mention that they are indoor right now and under 18-6 light.

even under 18-6 they will show their sex after a prolonged veg time, they just wont go into full flower or ball production.

They call em preflowers. They show at maturity regardless of light times.