TMI -- AF on her way?

AF is due as soon as tomorrow through the next 2 days. When I wiped I saw this, some brown CM. Usually when AF is starting I will get pink until it turns into AF. I do feel like she could be on her way though, I have very dull on and off cramping. Have you ever had this before a bfp or AF beginning stages? TIA for those who answer the TMI questions!!