Confused /:

So I was supposed to get my period Saturday, 4 days late, I've been (TMI) spotting brown for the past 6-7 day on and off and I don't know what it is?
Really confused,  AF is usually pretty regular!
(Also I havnt been using birth control since January) 
Shall I wait a few more days to get my period or call the doctor?  Or is it normal? Help