Little advice please?

I have a 3 year old boy and I’m 31+2 weeks pregnant, unplanned pregnancy due to precaution fails, kids have different dads, I get on well with my little boys dad (id secretly hoped for a future for us but here we are) it took me a while to get my head around the fact I was pregnant and about to be a mum again, I’m actually there with the pregnancy everything is ready for my little lady, her dad hasn’t supported me or helped to prepare in anyway, his family have been the same, as you can imagine how hard it’s been to be a single Mum, pregnant and working part time, as well as trying to pay to prepare for another child .... how on earth do I prepare myself for them all want to come over and see baby when she’s born? How do I get my head around dealing with all those people? I’m not ready to deal with how nice they will all be and fake :/