how accurate are the clear blue digital test

I'm anything between 4-8 weeks my last period was on the 3rd of November and my missed period was due on the 1st of December on the 23rd of December I got a pregnant 1-2 weeks on a clear blue digital test and a faint like on a paint dye test I took another pink dye test yesterday and the line has gotten slightly darker and this morning I took another test 11 days after my first one and they say the same why is this.

11 days ago

Yesterday

11 days ago

This morning