10dpo More Cramps...& Spotting

This afternoon while watching baseball, I started really feeling like AF was coming...cramps and a backache...so something told me to go to the bathroom. I had some watery, brown spotting. Only a couple tiny drops, then a little bit when I wiped. Very unusual for me. I always have a 14 day luteal phase. In 9 months of charting, I haven't noticed anything different, so it seems unusual that this would be my period coming 5 days early. The cramping (which feels more like lower back pain) is still there, but the spotting seems to have stopped. My temp is also still up. I guess only time will tell...