Late period

Maybe I’m over worrying myself but yeah uh So I feel a bit weird posting this but I can’t confide in my mother about my worries even thou I’m not at all sexually active lol.. but my period is almost 4 days late then my normal schedule. I don’t use birth control so I’m on a natural period cycle I guess lol I guess I just posted this to maybe lift my worries lol but if anyone has any ideas about what could be up I would love to know ^^”