AF 3 days late...opinions please!

Jennifer
So af is 3 days. I tested 2 days ago and a thin line with color showed up and everyone says its just evap bc it's thin. I'm not ready to test today but I'm curious bc I had very light spotting on and off about 2 weeks before af was due and now nothing. Has anyone had spotting about 1-2 weeks before af and then af be late? If so what was the spotting from? I've never spotted almost everyday before my expected af so I'm just curious....opinions please!