I also understand how you are all feeling
I have been TTC #2 for over 4 years now and it's definitely not getting any easier to hear such news. When I had DS I was one of the first amongst family and friends to have a baby, now many of them have had their 2nd child. It's hard to be 100% happy for those we care for when we want it to happen to us too and it's totally out of our control.
I do believe that it's normal for anyone in this situation to feel jealous, I think it's actually normal and nothing to feel guilty about.
Best wishes everyone