Family pregnancy and miscarriage

My sister in law and I were pregnant (both for the first time) together. We were so excited to be on this new journey together. About three weeks ago she found out she had a miscarriage. Our whole family is feeling so sad about this loss. Now I’m scared to mention my baby to that side of the family. We find out the sex soon and of course I want to tell them and share exciting news. I don’t want to be insensitive or make anyone more upset than they already are. I’m so worried. I feel so horrible and selfish. I’d really appreciate feedback from you ladies.

I’m still trying to give all of my support and love while everyone is grieving. Should I stay quiet about our baby and give everyone space until they reach out to me and my husband? How can we share our news in the most sensitive way possible?