Trying to be happy for others

I had a m/c October 29, and while I was obviously devastated and heartbroken, I have managed to get myself to a pretty good place mentally. I've stopped bleeding and my husband and I are looking forward to trying again. Today, my step uncle and his wife revealed they are having a baby girl. I didn't think it would affect me like it did, but it felt like a punch in the gut. I shed some tears and really am happy for them. But we so wanted a girl. It's hard to put a smile on when it hurts so much.