Why did my cycle change?

tracy <3

It used to come very late in the month but subtly has started to become earlier. I just got it today, the 16th, but it has been coming in the mid to late 20s for a while now.

Background info: i’m 16 (17 in 2 months) and not sexually active. The only thing that has majorly changed in my life is moving to a new place and not getting chemical straighteners anymore... idk if that would have any effect.

I don’t think anything is wrong, just curious. Thanks in advance!