You might be seeing preflowers or just some new leafy growth. If truely pistils, make sure you are in at least 18 hours light. Flowering this early will limit yield. If you continue to see further flowering, you may have to start flowering early. Outside or inside? If inside clones, try to revert to veg by 18/6 onward or 18/6 for 2 weeks then 24 continuous after 3rd-4th node. Probably be able to re-veg as long as you can keep em inside....