what kind of plants are these??

ive got 6 plants growing in an indoor setup using flouro lights. they're 2 weeks in and are growing at an excellent rate considering im using a flouro. Ive seen completely developed males before but i cant tell if i have any right now. they were all grown from the same seeds but the leaves and the stems have me guessing it might be a male. even though it early in the veg cyc. is there any way for me to tell the diff.

any info would be great!!

The bigger plants usualy turn out male but you can,t find out for sure untill they are flowering.

u'll know when the time comes..