Just that really. Reasons why my crazy mind is telling me I might be:
FF has identified a possible trisphasic curve identifying a possible implantation
My cervix is sore 
My CM seems to be increasing in quantity rather than decreasing, and hasn't moved away from 'creamy' even though AF is nearly here
My cervix seems too closed for impending AF
I've been very tired and very hungry - both unusual for Little Miss Energetic let's-go-for-a-hill-run-after-finishing-a-12-hour-shift here 
My abdomen is tender to touch
My nipples are a bit tingly
My breasts are extremely itchy, especially around the nipples
My nipples have been quite swollen for the last week or so (though less so now), and I think my breasts are a little bigger
And the reason why I can't?
My Day 21 test gave a progesterone level of 17. My GP isn't sure I even ovulated. I think I did (bbt/CM/CP/OPK results), but this level wouldn't sustain a pg, would it???
So, can you lovely sensible people just tell me I'm an idiot and to shut up, go away, and await AF? Due tomorrow or Thurs.