Pregnant and diagnosed with cancer

At 33 weeks pregnant I was diagnosed with breast cancer. I'm now 36 weeks, my baby is now coming via planned C-section next week, obviously earlier than expected so I can start treatment ASAP. How do I still find the excitement and joy in having a baby without feeling the looming dread of having to go through chemotherapy, immunotherapy and surgery in the weeks following birth? I feel like my pregnancy has become tainted by this bad news, every appointment and conversation feels like it's about both things instead of focusing on one or the other. So, I guess my question is how do I focus on the exciting parts when I'm scared of everything else there is to come?