I am so so sorry for what you are going through...
I lost my little girl at 20 weeks, although not through SB or anything similar, no cause was found for her death. I cannot even imagine the feelings you are experiencing right now with the thoughts of what may lay ahead for you and your little girl. I decided to have my baby girl buried in a communal grave with other babies, organised by the hospital. I was in no fit state emotionally to be able to organise a funeral, although now i wish i had had the strength to. Having said that, i did what was right for me at the time, and that's what you must do too, if it comes to it.
I would also recommend (like another member said) writing a list of all the things you want to do when she is born. Photos, footprints, have her measured, have her weighed, wrap her in a blanket, dress her, take her a teddy etc... the thread in the stillbirth section which lists all these things you can choose to do is so so helpful. I still wish i had held my daughter for longer, but again, you have to do what is right for you at the time.
You will be in my thoughts
xxx