BBT not making sense

This is my 1st time charting and naturally my chart makes no sense. I guess I had a slow rise in my luteal phase and AF is due today. My temps are still way above the coverline though. I have very light spotting, mild cramps but no signs of my period actually starting today (or even tomorrow). All HPTs have been BFNs. What's up with my cycle? Can anyone comment or help me make sense of this?