Officially 2 days late, negative results

Katey
I'm usually never late. I usually get AF one day before the app says, but according to the app I should have started Sunday. I have no cramping or spotting or breast tenderness( my usual signs of AF coming) the only noticeable difference is that my CM has increased and is slippery/clear again. I took a test yesterday and this morning, both negative. 
​I'm confused. :\