Do people know your date? You can just avoid telling them until you feel ready.
I'm a say it as it is person, so it's easy and simple for me to just tell people to not come. I also have no problem telling people to go away, but I realise this isn't such an easy thing for others to do.
Use the midwives too. Tell them you don't want visitors, or give them a code word or something for you to let them know when you are ready for people to leave, get them to tell the visitors to go. I alway tell my woman I will happily be the. Ad guy for them all they have to do is tell me when to send people away.
Ps, all the best for fri!!