Grease Monkey

Finally starting to see pistols. I've been waiting what seems like forever. Being my first grow I'm assuming preflowering has begun? My brother keeps telling me to bring it in and start the 12/12 cause unfortunately I don't think I can leave it out cause I didn't start the germination and sitting it outside until the first week of June so I'm thinking by the time the light cycle changes the temps will be to cold