Not yet, hold on for 15 to 25 more days. A small number of pistils are not flowering yet, its pre-flower, at about day 25 from seed you will notice a bunch of pistils coming up from the top and from the other bud sites, even tho the top ones will be more noticiable first. You consider it flowering then, and even then you should wait about 10 days to change it to bloom nutes.