It might seem like everything is revolving around the pregnant party. That is because it absolutely is. Pregnancy triggers all the instincts and overrides buried in the self-swamp of goo-wiring we call a brain, and that can be a surprise. You've been living inside your own skull for decades, decorating the place and filling it with all the things you like, and one day you find there's been a bizarre anti-murderer locked in the basement all this time. It bursts out trying to create more life, and it's a more unsettling change than hearing rustling in the crawlspace after noticing all your knives have gone missing. These things are instincts, and they make us prioritize the pregnant because otherwise there won't be anybody.
You might not want children yourself, which is extremely fine and quite a lot of fun, but you'd have to be a shrieking incarnation of insane selfishness to think that your friend's pregnancy should be about you. Hey, Cosmopolitan, what do you think?
You are absolutely an insensitive garbage person for feeling that way.
The idea of the mother goddess is ancient, outdated, and an extremely good role model when ministering to the pregnant. Especially if that status is your fault. The mother should be treated as a primitive creatrix: You go to her shrine if you want to communicate with her, and you bring offerings of food. Pregnancy turns standing up into a full-time job, because you're standing up while building an entire other person.