AF 18 days late.

I am now 18 days late, I took a test 3 days ago and it was a negative, the control line was very dark pink and I took another test just before, fmu. And the control line isn't as dark now, it's like it's fading, but I'm not getting a second line. 
I took a test when I first missed my period and had two lines and after that I'm only getting one line but the control line is getting lighter? Anyone out there who has got a negative after missed period but kept waiting and got a positive? 

Vote below to see results!