Is AF coming?? Hmmmm

I stopped taking my BCP last month, had my "period" on February 2nd and according to Flow, my period would be due tomorrow if I had a 28 day cycle.  How am I supposed to know when my period will come?  I have no AF symptoms (which I usually do have cramping a few days before).  The only symptom I have today is some CM, which I also had with cramps for a couple days one week ago.  When should I expect my period? Or when should I take a HPT