Advice!

So my sis and bro in law live with us and she was also pregnant and due about two weeks after me. Her first and this is my second, but they just found out that her baby died @ 19 weeks so she is going through a rough time and we talked yesterday and she told me it hurts for her to see me walking around pregnant, and my baby is still alive and she is just depressed trying to grieve. & she doesn't want to be around babie or kids atm. My question is: how can I still be happily pregnant and excited for my little one when i can't even make comments like that in my own home anymore. I feel guilty because I am still pregnant and she isn't. How do I get over this guilt, and how can I be happy without it looking like I am rubbing it in her face? We are good friends & I want to help her grieve, but my case isn't doing any good for her. Help? I'm stressing :(