I'm so sorry for your loss and sorry about your partner's reaction. I'm in the exact same situation. I recently had a second miscarriage and have felt like I had 0 support from my partner both times. He just ignores the situation and becomes so distant. But believe me, they are hurting too.
For most men, carrying on as though nothing has happened is their way of copying with the pain. They won't admit their feelings to you, they mask it with a facade of acting normal. It's so frustrating I know. You just want to scream at them for not getting it, but honestly he needs support just like you do. Have a heart to heart with him and ask him how he really feels. Tell him that you won't judge him and it's completely normal to be emotional.
You're eachothers rocks at this hard, hard time. I completely understand you right now, it hurts to feel like your partner, the person who helped create this baby, doesn't care. But just know that they do care, they just pretend they're strong so they can cope.
My partner actually admitted to me today that he cried alone about it (and he's not the type to cry about much). He said that he didn't want to tell me how he felt because he saw how damaged I was about the miscarriage, and didn't want to put anymore stress on me. This all shocked me so much, because I was beginning to think he didn't even care. But it just proved to me that men and women are wired so differently. I wish we weren't, but these difficult times really make you understand eachothers differences.