Opinions please!!!!

My fiancé and I have been TTC for awhile now and my periods haven't always been regular but for the last 7-9 months I have been pretty regular (maybe a week or so late or early). Anyways my last period was November 19 and last month in December when glow showed my 33% (most fertile day) my fiancé n I had sex the morning before and I still haven't gotten my period. I'm not feeling nauseous or cramps or anything. My question is should I take a test or wait a week or so longer to see if I get it maybe I'm just being irregular again?? Any opinions on what I should do??