The pollen sacks look somewhat similar to the starting of female flowers, only they look more like a ball than a tear drop. And the female flowers will quickly show at least the start of pistils coming out, where the pollen sacks will need to fatten up and fill with pollen before opening, so they remain a ball with no pistils exposed. If the pollen sack opens.. it'll kinda look like a yellow banana sticking out of it, for lack of a better explaination. I would just google image search for pictures of male parts and then search your plant. I would bet money on the fact that the 4 hours of extra light didn't cause it to hermy. If you do find male parts at all then its probably either genetics, or caused by something else, or perhaps just a combo of things.

Also, people usually record their flowering time from the first day they switch lights to 12/12. Not when the first pistils appear. When it starts showing pistils it should be about a week into flowering, or it would be a mature enough plant to have pre-flowers, which may show some small pistils as well.