I can see a preflower in the very first picture you posted.
Towards the top of the picture, where you have a fat branch shooting off to the left. The the right of that, there is a shoot that will turn into a budsite popping out. At the very bottom of that shoot, on the right-hand side, is your first preflower.
At this point, however, it could only be determined with a microscope. It is way too small to determine with your bare eyes, but in about 7 days, it will have swollen and you will either see the emergence of pistils or some nads. I wish you luck mate!!
My gut tells me this is a female plant, the early shape of the preflower seems to indicate that. Males will sex earlier, and their preflowers grow rapidly, turning into obvious nut sacks within 3 days. Females can be more stubborn, and only show the formation of a calyx for about a week before it even shoots its pistils out. If you have a microscope, and you look at the spot I pointed out in 2 days, you will know for sure...(The calyx will start to split to allow the pistils to emerge. If the preflower is circular and doesn't have a gap at the point of it where pistils can emerge, it is a male.