How to overcome this fear?

So a little back story, I have one child already and due my second in April. Me and my husband were trying for baby no.2 for quite a while but during that time my MIL was diagnosed with stage 4 ovarian cancer. We briefly stopped trying however she made it clear she didn’t want anyone putting their life on hold because of the diagnosis so continued to try expand our family.

Since I have been pregnant I find it incredibly hard to plan things like buying baby items and don’t want a baby shower. I feel like I’m constantly scared of something going wrong which I know I felt a bit with my first however this time is very different. Like so many people have said things to me like ‘this will be the last Christmas as just the three of you’ or ‘think about this time next year, you’ll have a little baby’ etc. And every time something like that is said I can’t get excited like they seem to be, instead I get a pang of anxiety and fear.

Since my MILs diagnosis I feel like I can’t look that far ahead in life because we have no clue what things will be like, the last 6 months have been pretty hard for us all and a rollercoaster I don’t think anyone wants to be on.

I love this baby already more than anything but I really want to look forward to having her instead of having this dread of the unknown.

Sorry this post is long, any advice on how to overcome this fear of the future and mortality would be really appreciated!