My period is late! (I'm 14 and I'm not pregnant!) Does anyone have any ideas why I could be late?

Inkyivory
I'm 14 and my period is late... I have NOT had sex or anything! But, I haven't been having much sleep lately because I've been on holiday and I've been really busy, so could that be the reason why my period is late?
(I'm worried :()
Could there be any other reason's why I'm late?
Updates
+1 y
Thanks guys! You've all really helped alot!.. Thanks! :) Means alot!
My period is late! (I'm 14 and I'm not pregnant!) Does anyone have any ideas why I could be late?
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