My period didnt *** yet and i didnt hav ?

cn a period just b late even if ur not pergnant? im 13 and ive nvr had ive had my period 4 a yr and i get my period evry month between the 25 - 31 ..well 2day is the last day in sept. and it wouldnt *** on the 1st but this has nvr happened idk mayb it'll *** at night but could it b late ?