What do I say or do?

I'm pregnant, 21 weeks, my husband says he not excited, when I ask him, but that he's not disappointed either. He doesn't care about anything baby related really... I just feel so alone and like this baby is unwanted (on his part). This was a planned pregnancy and he kept up with my ovulation days, so I'm just not sure what the problem is. 
Has anyone else's SO felt this way but later changed when the baby got here, what did you do? 

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