All of these ones (yes, some of them might seem to be contradictory).
a protective tenderness. You want to offer her a seat, or get her a snack, or stand between her and the person who’s about to try to touch her belly.
a creeping biological horror, as if watching a video of Cordyceps fungus infesting an ant, changing its behavior, killing it, and erupting from the back of its head.
a strange, slight jealousy. You don’t want to be pregnant; and yet.
irrationally terrified that she might break her water or throw up or something and you’ll have to deal with it.