Determining the sex of plants

[Fingerpuppet]

High!, I'm very new to growing, I'm growing from bag seed, so obviously I need to sex the plants, it's been 7 weeks since they germinated, and I'm still not seeing any Preflowers.
my question is, can I switch to a 12/12 light cycle to promote ? Pics to follow when I figure how to

 

[starramus]

Have you used NebulaHaze 's comprehensive guide? https://www.growweedeasy.com/preflowers#intro-sex-in-week-3-6

 

[JDU]

Yes you can flip em to 12s long enough to see the sex & then pull em back to veg.

 

[Fingerpuppet]

Yes I have , but does not mention this situation

 

[Fingerpuppet]

Ok ,thanks for the info

 

[starramus]

a lot of trouble just to determine sex. Why don't you let them grow a bit longer. there really is no danger in doing that. cannabis does not suffer from premature ejaculation. be sure, and check NebulaHaze 's pics closely. the beginnings of preflowers are very small.

 

[Toker1]

You can flip, but this will add sone time to your flower cycle. If you wait for pre-flowers, you will see buds a few weeks earlier than if you don’t wait.
if you just want to determine the sex, I would cut a few clones and flip the clones instead. That way you don’t lose time in the re-veg on the mothers.

 

[Jordann]

I attached some pics of plants showing sex at 4 weeks without switching to 12 12 all males here

 

[Jordann]

Sorry the 4th and 6th are female. With the hairs and the others are starting little balls.