Showing pistils starts the beginning phase of your true sex. At this time, your plant is showing her sex. Which means she is in her pre-flower stage. It is NOT THE BEGINNING OF FLOWERING STAGE. Preflowering stage takes about 2 weeks. This the time you can’t mess up because this the time she will dedicate her next two weeks to push for further vegetation. You will see her growth explode almost half or double it’s size. Once she stops GROWING, that’s when her official FLOWER stage begins.