Ah of course - food! Looking after you is Number #1 priority my friend. This is your's and DH's shining moment - letting them rent space in your mind when you have so much going on is maybe not helping.
Obligations are like a black hole - they suck us in/attempt to lure us into our childhood conditioning - when we feel ourselves ruminating/venting - pause and remind yourself whose life this is. We are not those kids anymore who had to bend our values/boundaries to fit our BPD parents.

I am just going to have to suck it up and tell them that I am not ready to see them and don't know when I will be.
Good for you! My SIL had a baby back in September and she even asked family to give her space - it takes time for new moms to adjust - this is about you.
It's not my job to feel guilty that my mother may not get to meet my new baby when it is brand new, that is a consequence of her behaviour, namely telling me that she was at that moment committing suicide because of me. I'm not doing it to punish her, I simply can't yet get past the hurt that she caused with that action (and the others surrounding it that she still hasn't acknowledged let alone apologised for) and if she didn't want this to happen she should not have caused that hurt. She had that choice and my reaction isn't 'wrong' just because it hurts her. That's an affirmation for me.
I know you are hurt - so was I - acknowledging you hurt is part of the healing process - its this remembering stage of our healing that helps us then mourn - Over to the right of the screen is the Survivors Guide ---> you are probably at that stage where denial is no longer an option - you may see where you at in that guide quite clearly I am sure.
Yes, and I know why I feel guilty - it stems from being the fixer and not being accustomed to looking after me. If your upbringing was anything like mine, I was not permitted needs - I was made to feel guilty for it and now carry that belief into adulthood.
Its those faulty beliefs we need to process using Wise Mind.
Ah yes choice - wouldn't it be nice if they could 'just' see the damage! Unfortunately this is what we mean by radical acceptance. Understanding our parents are imperfect - accepting these imperfections and now taking charge of our life - relinquishing that childhood conditioning and grieving our childhoods.
You deserve to be angry and we also deserve happiness - to do this we need to learn acceptance.
I hope very much that they won't be so tactless as to bring it up during the 'congratulations' phone call I know will happen right after the birth but if they do I will try to look at it as getting the conversation out of the way. If she kicks off or starts acting like a wounded victim at that time I will just have to leave the conversation.
How am I doing here?

She may be tactless - can you dig down to figure out the reason why you feel a congrats would be tactless? Why it concerns you?
Definitely, don't bargain with the whole woe is me trick - trust yourself that you have the necessary tools to cut a conversation short if you are uncomfortable - you have the tools, you can and will protect yourself if the need arises - this is the difference between feeling victimized and feeling in control of your own destiny.
You Go Girl - Be pregnant and Proud

You are going to be a Mom - time to look out for your own family now.