Sex (pic inc.)

My little girl is about 21 days old in a aerogarden. Was curious if it is still to early to see the sex or not and when can I tell what she is.

I have a bunch of these little hair like things at each node. This is my first grow so as far as I know about sexing is from what I have researched.
 

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I know generally you need to put it under a 12/12 cycle but can they show before doing 12/12 and how long into my 18/6 cycle should I switch to 12/12
 
Ty prof. That pic helped out tremendously and I now understand what I am looking for.

Now will it only start to show my sex when I switch to 12/12 or can that come earlier?

And when should I switch to 12/12 using an a/g7?
 
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