Should I test for Preg?

I stopped taking BC March 3rd midpack (2nd week into pills & also wasnt consistent with it and took it late). Had unprotected sex the day after, then had breakthrough bleeding march 7th with ewcm, then had unprotected sex march 9,10,11, & 14th. It's been 17 days since I last took the pill. I've had cramping for 4 days and still no period, which is weird since I always get my period the day after the first cramps. This was my first pack ever btw. Should I test for pregnancy since I didnt get my period for the placebo week (but then again, i stopped the pack going into the 3rd week) I also didn't get my expected period like I would before I got on the BCP. I'm 3 days late. I havent peed yet!