4 days late

My period is four days late. My period was due Monday September 15 the night before I was cramping like I was about to get my period but it didn't show up. I cramped off and on this week, then this morning when I wiped I saw light pink when I wiped. And saw it again this evening only when I wipe. Still cramping like I was all week but still no Aunt flow. Contemplating a pregnancy test. What do you think?