I'm pregnant and my sister lost her baby

Amanda • Married since May 2015 | baby girl born on February 2017 ❤️❤️ ☺️ #newmommy.
So my nephew was born @ 24 weeks about 6 weeks ago. He was doing good and we all had hope. The past couple days he took the wrong turn and passed away this morning. I got to hold His little cold body I'm so hurt for my sister I don't know how I can help. I've been crying all day. I planned my pregnancy but I feel like it's just horrible timing. Our babies were supposed to grow up together. The amount of pain I'm feeling I can only imagine how horrible it is for her. I'm giving her time but I feel awful. I'm 3 months and I'm scared once my baby is born it's gonna break her heart.  I just don't know how I can help when I'm falling apart myself and she doesn't respond to my text since I left the hospital.