Late periods

My periods are ALWAYS 30 days apart. But starting in June, my period was 3 days late(with some spotting at the beginning which never happens)In July it was 5 days late. Andfor this month, it was supposed to start 6 days ago but not here yet. Should I see a doctor for this or can this be normal?

Im not pregnant. Literally nothing has changed in my life. No stress. No diet change. No exercise change. I’m not on BC or any medications. Should I get it checked out?