I'm not going to act enthusiastic about someone else's pregnancy
Is there a reason why you aren't excited for it?
It's someone I don't know that is pregnant with a child I will probably never meet
If it is someone you don't know and will never meet, then it makes sense you are not excited. There would be no reason to get excited for a stranger.
That is exactly how I feel.
There are more avenues for you to get excited than just a stranger getting pregnant. There are more pressing things you can put your energy into.