So Sad it Hurts

Nurisbel
I'm 6 months pregnant. I've been so excited for this baby .. And I still am. I'm just so hurt and worried my mom has cancer and the doctor told her it's so advanced now that he doesn't think she'll make it more than 3 months. Idk what to do. I want to be there for her so much.. And it's so hard to be so happy for this little blessing that's inside me when I fear she won't even get to meet her. How can I be happy ?? I don't even know how to explain this to my husband.. He alrdy knows about my mom.. But how so I say sorry I'm not so happy. I love this little blessing more than anything but it's so hard to be positive and happy during such a hard time. :(