Am i wrong? Help me understand?

I’m really NOT trying to be offensive. I just don’t don’t get it? Sometimes on this app I will see posts and it seems to me a lot. Where people are complaining about other people’s pregnancy’s saying things like it’s not fair they have only been trying a month, or it’s not fair because I have this and she doesn’t or they will get mad because someone accidentally put a positive pregnancy test in the wrong group. Sometimes it makes me feel bad when I’m pregnant. I just don’t understand what it has to do with them? Why can’t they just be happy for people? Why does other people’s fertility even affect there’s? Sorry for being pregnant 😫 I don’t know if I’m being moody or overthinking but it seems some women resent those who are pregnant.... 😬 like I said I don’t want to offended anyone but why?