Seeing pistils are just that pre flowers until you take the plant and switch its photo period therefore switching its bud producing genes on and veg genes off so to safely give the plant and yourself sufficient time for it to flip so it is fed right and you dont cut it early give it a week for all the genes to switch to their desired function and count flowering time from there but also flowering times vary from strain to strain so learn and study the plant you are growing also see what others have experienced with the same strain
hope this clears it a bit better for you