to think my cat can see a ghost?

[SoleSource]

He looks at the doorway at the same spot each time and his eyes/head follow 'something' that is invisible to me. He has a confused facial expression and sometimes he meows

It freaks me out

AIBU?

He is probably just contemplating whether to lick his arse or not.

I'm pregnant??? I have a four year old baby inside of me?