Help! I haven't had my period !

My period is 9 days late and it's never normally this late 😐 a few days ago I had the smallest amount of blood on the tissue ( barely able enough to call a period ) and non since !!! I'm 14 so j asked my mum the day it happened and she said my period would co e the next day but it hasn't ! Does anyone else get this ? I'm freaking out