Solid smiley at 3dpo?

Question

I got my peak positive opk on cd17, here :

And today at cd21 I just got my solid smiley on clear blue digital opk??

I dont get it ?! 
I took a normal opk at the same time and its negative :

Any ideas whats going on ? My theory is if im pregnant maybe its picking up the oestrogen as this digi picks up 2 hormones ?? 
Thanks ladies x

Answer

Btw i never got a blinking smiley just solid one x

Answer

Anyone?? X

Let's Glow!