Yes that's right, those appear to be the first initial flower hairs (pistils). They can appear green for the first couple days like in the picture, then white, then later orange or red as they age. They can show at the top of the plant first sometimes, or at the intersection of the main branches and stalk sometimes. It signals that the plant is indeed female. In nature, those hairs catch pollen and that is the entire point of all of it lol. Most of the time for us though, they're never gonna catch any pollen, and just become fat with protective oils / trichomes instead.