Help, very confused!!!

So I just took my last sugar pill today and still have no sign of a period. I have been on and off spotting for a couple weeks but mainly was light brown/light pink and only had a little bit of light blood a couple days ago which quickly disappeared. I missed my pill about 3 times this month and my boyfriend and I were not using and additional protection. Should I be worried and test? I usually always get my period within the first day or 2 of sugar pills. My spotting has completely stopped now also. Anyone had this happen to them?!