Poly miscarriage

My spouse (31 cis male), myself (30 cis female) have been dating our partner (30 trans ftm) total since January. Our partner ended up in the hospital and we later on found out that he had had a miscarriage. I felt numb about it for the last two weeks and am coming to terms with it now. I told one of my closest friends about what had happened. I have known this friend since we were little so much so I call her my sister even though we are not related. She responded by saying that the miscarriage can be considered a good and a bad thing. This caught me off guard so I just told her the truth which was that we all wanted it. I dont know what to do about this friend. We are not the only polycule she knows, shes friends with another one that I am also close to so she does know better.