Confused !

Yari ❤ • Tue, Dec 02 • TTC For Baby #2 Have A Beautiful Lil Boy Hoping For a Beautiful Lil Girl(:

So my AF Was suppose To Be Here November 30 and still haven't got it (Hoping it stays that way) and went to edit the period on my calendar and I notice that it said late period so I clicked on it and my AF changed to the 4th of this month . Did it change cause I'm late ?