When AF is late, what is CM like?

Just curious what everyone else is experiencing. I've never been pregnant so I do t have anything to compare this to. 
I am currently 10 days late. I just took my 4th hpt and got a BFN each time. Usually when I'm about to get my period I'm bone dry, which I was at first, but the last few days I've actually started having some sticky CM.  is that normal?
I stopped taking the pill a year ago and have had pretty regular periods since. I've never been 10 days late and I haven't had any major stressors lately. My breasts have been sore for about a week but that's pretty much it.