is there a possibility?

My period generally comes the 9th of every month give or take a day. This month it was 4 days late was light the first day ( normal) heavy the sec (normal) not its like gone,very light. ( not normal) could I be pregnant? Should I take a test or wait till next month to see if I get my period? Also haven't been stressed ( anymore then usual) I didn't even realized my period was late till I checked my app to find out I was 4 days late, then it came next day.