Hi eurochick. First of all, congratulations on your pregnancy!! (I used to lurk on the lovely BESH and 10+ threads
). I'm so sorry you're having such a worrying time and I know the time before the birth can be the most worrying of all when you're expecting to deliver prematurely. It's normal and sensible to be frightened, but 31 weeks is already a good gestation, and the odds of all going smoothly will only get better as you go along.
I had my DD at 29 weeks and she was in NICU/SCBU for most of two months. It was terribly frightening at the time, although she had a smooth-ish ride for her gestation, but she's now a lovely, cuddly, bouncy one year old.
Previous posters have given lots of really great practical advice for the NICU stay, so I won't repeat that.
With regards to the birth - I didn't have a C-section but I did have a retained placenta, and I get the feeling most prem births end up feeling like very grave, very medicalised affairs. I'd read up on birth procedures fairly extensively beforehand, and I found it definitely helped me feel more in control on the day and also communicate better with the staff. If it's any consolation, it definitely wasn't the birth of my dreams, but it was still an ok birth and I feel happy thinking about it.
It's possible to breastfed a premature baby. Mine is still breastfed now! It can be a slow process, and you might end up with a gastric tube, finger feeding, and some bottle feeding - and all that's fine. It's great that you're getting expressing advice. A pump can also work for colostrum. I'd really recommend renting a hospital-grade pump (Medela symphony or Ameda Elite, if I recall correctly).
I think all 'prem mums' very much feel that their body has let them and their child down, and I can imagine that feeling would be exacerbated when you've had to go through IVF beforehand. I had great support in the hospital I delivered in, and pretty much every single health professional I spoke to in the first few days after the birth went out of their way to reassure me that it was in no way my fault, that I did nothing to cause it, that I shouldn't feel guilty, and that it was normal to grieve the pregnancy I had effectively just lost. It can be devastating having a pregnancy end early, even if the result is a baby, and I think it's important to acknowledge that. That said, the end result will be a baby, and (if you haven't already done so), I'd recommend taking lots of bump pics, shopping for baby clothes, preparing the nursery, packing a nice hospital bag, planning the birth announcement, finalising names, etc. A prem birth can feel very 'abnormal' in lots of ways, and I think doing nice 'normal' baby things before and after can be very soothing. I did some but I wish I'd done more!
On that note, and thinking of the return home, I second mini pie's suggestion of getting a cocoonababy. It's pricey, but the position is good for former perms, as it helps them bring their hands towards the centre of their body, something which they can sometimes struggle with more than term babies. They also find it comfortable and soothing, I think.
Sorry this is a bit disjointed, but please let us know how you get on. I'll be thinking of you and keeping my fingers crossed that you can keep the baby onboard as long as possible.