I am totally in the NOT TELLING CAMP!!!
I will not be telling anyone till after bubs is born...

You will have to make that clear to Shel if you want to go down that path, and make sure she is OK with keeping it secret too. Surely she want it to be a special private moment for the two of you.

If they do show up I am sure the midwives will keep them out of the room, and you will just have to do your best to block it out. Make sure you tell the front desk of the birthing suite too who you permit in your birthing room... (Maybe put it in writing).

You have some great advice here, and I am suer you will get the birth you want somehow.