Late period

My period was due 3 days ago. I had sex on a majority of my fertile days. I tested with the Walmart .88 cent test two days before expected period, but was negative. That same day, I was cramping in my legs and lower abdomen, so I knew AF was on her way. The day of my "period", those symptoms resided and I no longer felt like my period was coming. I am now three days late... Yesterday at being two days late, I tested with Clearblue. It was negative. My periods are always my normal 28 days cycle and an average length of no more than 5 days. I "felt" like I was possibly pregnant, but all my hopes got shot down with that BFN. Anyone experienced this?