Late Period

So my normal cycle is usually 5-6 weeks. I've been using Glow for about a year now and it's usually pretty accurate on the period calendar. My boyfriend and I use condoms, but I'm not on the pill. My period is 2 weeks late (so my last was 7 or 8 weeks.) I'm scared I'm pregnant.  And with my period being naturally late, I don't know if I should get a pregnancy test or just wait it out a few more days.