Missed.. need opinions!

So my period was due on this last Saturday and I still haven't started.. I've been feeling a little crampy but not like I usually do.. I only had sex once last month and we were super careful (I'm in a long distance relationship and only see him once a month.) I've been super stressed with school lately, so that could be why, but what do y'all think? Should I take a test? Or wait it out?