My period tracking isn’t usually exactly accurate to my actual period schedule

Since sometimes it comes before or after the expected time. Anyways I had my period last month but I haven’t had it this month ever since quarantine started. I’m 16 btw and never been sexually active so obviously not pregnant but ive been staying up late most nights and kinda stressed about certain things like school and other personal things and I wanna know if this could be the reason why Cuz I’m pretty sure it’s a week late. Also if it is the reason why then maybe some tips to lighten up so it come normally especially during these stressful

Times. Thank you!