AF DUE...BROWN SPOTTING INSTEAD

Melissa
So I had BFNs 9,10 and 12dpo. After was due 12/27 which would have been 14dpo. I've light minimal brown cm when I wipe but rarely touching my undies. Some days nothing when I wipe. This has never happened to me before. 
Anyone have this and got a BFP? Been trying for nearly 2 years.