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!
Probably better to save "Now there are two of them" for when they realize it's twins at the end, with ghost Nute delivering the line of course.