Missed period

I know this might sound stupid but My last period was in the second week of August and I haven't had one since and I don't have a clue why and for about a week or two in September and now this week i got and I've been getting all my normal period symptoms, cramps,backache,acne,ect. But no period and I've started to get really concerned does anyone have a clue to why my period would be this late

My period has never been later than five days from when it was supposed to start