It is important to keep the dark period, 100% dark, no light leaks, no flipping the light on for 2min for a look, and no messing with lighting times.

What will happen is your plant will stress out. During the early stage of its life, expose it to light or stressing it out will give you better chance of a male plant, which produce no buds or THC. If your plant is on 12/12, you're going to hermie it, resulting in seeded buds and male plant matter.

Don't mess with the lights, stay on schedule and don't change around the lighting times. It will do more harm than good.