Texas,

Sometimes, a plant will show preflowers. Sometimes they will not. They aren't 'supposed' to, in other words, it is more rare than it is common.

By looking at the first set of pics, I would doubt these are going to preflower.

Like Zandor said, just give it some more time. It usually takes 7-14 days to bring the sex out...assuming they are in total darkness for 12 hours.

Happy gROWing.