scared about how my MIL will be with the new baby😳

Before I got pregnant I enjoyed my boyfriends mother a lot. I thought she was a really nice woman because my relationship with my mom was going south while I lived at home. I accidentally got pregnant my last year of high school and so my boyfriends parents started convincing him that instead of us getting our place, I should just move in so we don't have to worry about rents and bills with a newborn, nice right? It was a generous offer. But I feel like I have issues with overexposure. I can't stand being around someone that isn't my SO every single day. He works mon-fri 8-5 so I'm stuck at home. Even when I worked, I worked 5-9 so I was still stuck. I need space. I close the door and they will still knock and ask if I need anything. I know they are just trying to be nice but I'm hormonal and also the type of person that if I need help or if I need something, I will let them know. I've told my boyfriend that I'm worried once the baby is here I will never be left alone. My only saving grace is he is going to staying home for a month. His job begged him to just work a couple days a week and have his mom help me the days she is off. I begged him "please no I need YOU." She is nice but she is a linger-er, she will invite herself out on our dates to the movies or if we go to get icecream, she'll be like oh can you bring me back something? Can you get this for me? If we are arguing, she'll be like is everything okay??? She'll randomly come into our room, sit down and start talking about random things, some things that are especially TMI that I really don't want to hear lol. I had to tell my mom she can't be in the delivery room with me because I KNOW my boyfriends mother would be upset that she wasn't allowed it. My boyfriends friend was joking around saying he's going to be there to support him and she goes "No! I'm the grandma and I'm not even allowed to be in there then you are not!" She works at a hospital that is affiliated wirh the one I'm delivering at and she'll joke around and say "oh I'll dress up in my uniform and come in" 😳 She has other grandchildren she doesn't see because they are states away so now im scared she is going to try to take advantage of the fact her granddaughter is right in her home. I don't want to end up hurting her feelings but I have boundaries too 😫