Any Help Please ?

Hi ladies! 
So Tuesday (9DPO) I noticed my CM looked a little darker. 
From yesterday (10DPO) it turned into brown CM - only when I wipe. 
Today (11DPO) again brown CM only when I wipe...earlier today it looked slightly pink ...now it looks back to brown. 
I have been getting cramping. 
AF is not due until Sunday - I am never early, always on time or late. 
Could this be implantation?? 
I have a liner in my underwear which has nothing on. 

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