AF 10/9 & Spotting ???

C • Sat, Oct 18

My fertile window starts tomm & I've been tracking my CP, CM & started OPK's. The test line is beginning & my CM is watery - thought I was going to ovulate this week. I woke up today & am having light pink/tan spotting! I've never spotted mid cycle & am very regular. We have not BD yet this cycle. What is going on ladies???