Autoflower noob

Hey guys this is my first auto grow under mars hydro ts 1000 Lights in a 2x2x4, lights are scheduled for 18-6 growing medium is soil.
I have noticed early in the grow that i had some white pistils popping out and now i am thinking that my plants are really flowering, can this be stopped? Can i change the light cycle from 18 to 20?
What the fuck should i do?

Autoflowers "automatically" flower around the 30-40ish day.. nothing you can do but keep on growing. Get photoperiod if you want more control on how long you want to veg.