Oh sweetheart. Have you got anyone on your side in real life? Sounds like you could use some support and advice, plus someone there to stand up for you. Having a baby is really stressful enough without having to deal with potential ex-related complications.
Firstly - you have no responsibility to have anyone at the birth - not even the baby's dad - seriously. This is completely your call and anything you find stressful is bad for your health and your labour, so put that idea right out of your head now.
I wonder if someone could recommend a doula to be with you - might not be something you've heard of, but it's just a woman who knows how it feels to give birth, standing by you helping you communicate your needs to those around you and generally being your voice and helper. I had one come to help me for free, as she was trying to qualify.
Also my friend came round and was brilliant.
Don't let him know, and tell everyone else NOT to let him know, when the time comes. And definitely instructions not to let him in. The birth is your thing.
If you are breastfeeding your baby, he will not be taking her overnight at all until she is much older - maybe a year or more? Not sure. But anyway - this is important. Don't be pressured into bottle feeding or routine feeding (ie not on demand) just to please him.
I think with little babies, if a bloke wants to be seriously involved, you are looking at short periods of time with her, maybe once a week or a few times a week if that seems more like it. (and probably with you present or close by in case she needs a feed)
Is this doable? I mean are you comfortable with having him in your house?
I hope you have got someone around who will support you and talk this over with you, and help fend him off if he causes you any stress.