by flowering,do you mean you see preflowers on it? If so, I'm seeing only a couple of preflower pistils on my photoperiod panama too. I heard that a plant can show signs of sex in vegetation if it mature enough and ready to flower.But I think it won't flower until you switch to 12/12. If it starts to flowering in a week and regularly shooting out pistils then it is most likely an autoflower and you don2t need to switch to 12/12.But if it is a photo,I think preflowers will stop appearing any more until you make the switch.