Feeling super alone

A couple days ago we shared our news with my husbands Brother and sister. They have been trying for two years and she has a condition in which it is extremely hard to get pregnant. We got pregnant on our first month TTC we told them we were trying and they seemed super supportive. When we told them we were pregnant they left the family gathering without saying goodbye or congrats. I get they're upset but I want them to be happy for us. What should we do?