How soon to

Test ? According to Glow my period should have started 2 days ago and it hasn't. According to my iperiod app I am due to start tomorrow but that would take my cycle to 32 days and my cycles aren't that long max 30 days and that was only when I had just come off this pill usually my cycle is 27 0r 28 days.  I'm experiencing mild cramps on and off for the last 2 days like my period is coming but nothing as of yet. Should I test ? Could this be my BFP *fingersandtoescrossed*