Am I just being petty?

Amy • Mom to 4 beautiful girls. 3/3/10, 4/27/14, 4/8/17, 3/7/19.
So I'm on the last 3 weeks of very possibly my last pregnancy. I'm excited to meet her and share her with my family and kind of have the spotlight if you wish on us for just a short while, but my wonderful brother-in-law and his wife are trying for a baby. They're 20 and their marriage is super unstable. They're constantly fighting and dragging everyone into their crap, in my opinion they should not be even thinking of trying, but they think they're well on their way to living the big life (they're not, they're living with our grandparents and have no intentions of moving out anytime soon) and they think they're super ready for a baby (she has a 2 year old from a previous relationship who's a monster) anyways they're the type of people who the second they find out they're going to just start telling everyone and making it all about them. She thinks she's pregnant and I just 😪 maybe I'm just fed up with them so this just frustrates me that much more, but I guess my baby is coming from a stable, financial safe household and I would like to just be in front of all the drama for a minute...is that wrong? Am I just being petty?