What do you do when your pregnant dishwasher won't make you food? Kick it in the stomach, pull out the dead foetus and eat it for nutrients.
Do you really feel this way about your partner?
It's just a analogy. I don't mean it in any literal sense. I only see the dishwasher as a dishwasher.
Joking about harming a pregnant partner isn't funny. You shouldn't make jokes about harming women. It creates an unsafe environment for your partner and she might feel threatened.