Late miscarriage advice

I need some advice. My fiances brother and his gf found out they were pregnant in june. About a week later, we found out we were expecting as well. Our due dates were 2 weeks apart and we were so excited to be experiencing this together. We could talk to each other about what we were experiencing in our pregnancy.

2 weeks ago, at 19 weeks she found out the baby had passed away when she went in for her ultrasound. Now, I feel really awkward around her. I don't want to talk about my pregnancy when she's around and make her upset but I also want to be happy about my baby too. This is her second miscarriage in 6 months so i just dont know what to say to her. How can I be sensitive to her feelings but still be happy about my baby? Any advice is welcome.