It's nothing and you can't tell what sex they are. Males signs usually show within the first week or so of the flowering period were the lighting it switch to 12/12... preflowers are tiny indications of the sex of the plant in the late stages of vegatative growth... its not 100%.. they are hard to find and sometimes you will need a microscope to see them. Hope this helps you out a little bit...
ok thanks... so how much longer do you think i got till my plants start flowering? cause this is my first grow ive been smokin for a couple of years and tried it before, but this time i was seirous about growing so