It's probably not auto flowering. An autoflower strain is most likely grown from someone who ordered the seeds, and was paying enough attention to pull the males. If its bag seed, it's not gonna be auto flower.
Unless you live in Alaska, Russia, Northern Canada, etc, where that shit will grow naturally.
Auto flowers are reuderalis strain. They are specially bread (for purchase), but do occur naturally.
The reuderalis strain itself is not very potent (probably because of the very little exposure to UV in the northern part of the northern hemisphere) but cross breading with NL, or Afghani, etc, caues a more potent reuderalis strain.
if it flowers without 12/12 I would say you have an autoflower. Not to get confused with preflowers. I doubt you got autoflower in bagseed though. good luck!