TV's Frink said:

Or...

Callback to TRM?

Pad: Something's happened...I'm pregant.
Ani: Is it my baby?
Pad: *speechless*
Ani: It's not my baby, is it?
Pad: *speechless*
Nute: Now there are two of them!
Ani: It's not fair!

Or you could swap the dialogue around with him whining about not being a Master. So it would seem like he's blaming her for the baby for some reason. Sort of...

Pad: Something's happened... Annie, I'm pregnant..

Ani: What? How can you do this? This is outrageous, it’s unfair!

Pad: *speechless*

Ani: Is it my baby?
Pad: *speechless*
Ani: It's not my baby, is it?
Pad: *speechless*
Nute: Now there are two of them!
Ani: It's not fair!