First timer trying to figure out preflower

Hello everyone I'm coming up on the end of veg week 5, and I think I have preflowers. I just want to make sure I'm identifying everything right before I start killing the males. All of them are unknown strain bag seed I've collected. Here they are
Plant 1: I think is female
Plant 2:I think is male
Plant 3: I think is female
Plant 4: I think is male
Plant 5: I think is male
Plant 6: I think is female

I think I got a few right. I'd like to get rid of a couple just for room reasons 6 plants in a 4x4 is just too much.
Thank you everyone.

I'd typically wait another week or so. But nothing wrong with keeping an eye on them.
I've been wrong before so I like to be 110% sure before I ditch any males I don't want pollen from