Congrats on your pregnancy. I totally agree with everyone else - tell them a much later date if you think they might just show up.
And I'd discourage houseguests early on (unless it's someone you're happy to have around and who is going to help out) - maybe suggest if people want to stay then they'll have to wait till 2-3 months to visit, when things are a bit more settled. Remind them of the crying baby through the night too.
All the best~~