Period prediction changed! HELP!!!

McKenzee

So my period was supposed to start 3 days ago and it hasn’t started yet. When I went to log in my info, the app changed to Sunday to start....

Ive been cramping for two weeks, low back pain, and oily skin. Feels better if I sit or lay down for a while. Should I call my doctor, take a test, or should I wait and see?!?!

HELP!!!