I agree with the others about making hard choices and setting boundaries.
However I believe the first thing you really need to do? Have a really really really big talk with DH and make sure you guys are on the same page 1000%.
First off he needs to realize that birth and labour? It's about you and no one else. Not even him. He needs to understand that what you WANT and you NEED goes. Nothing else and no one else matters.
Second he needs to realize that when he chose to be with you and have a baby with you that all "allegiances" to his mom/dad are gone. Of course he can still love them. But he needs to be on your side 100%. There's no playing the middle guy, there's no "being caught in the middle" or anything else. He doesn't have to agree with you all the time, but he needs to back you up publicly and discuss issues with you privately. But he also needs to be the one to deal with the inlaws. Not you. I strongly believe that inlaw relationships are the best when the hard topics are dealt with by the respective children and not the spouses.
So in this instance, he needs to talk to his mom and dad himself, after you two agree on what the plan of action is going to be. And he needs to stand by that decision.
"Mom I'm sorry if you are feeling left out, that's not the intention at all. We love you and want you involved, however at this moment the best support for us is if you hold tight and come help x days after the baby is born. I'm sorry if you feel sad that you might miss the birth, however we aren't comfortable having so many people in the room and would like it to just be us and possibly taylor1690 might want her mom but that will be decided in the moment. We are not having more than that. After the birth we'd love to share the joy of our child with you and taylor1690 would love some extra help from you x days after, if you would like to come stay. However if you are wanting to come before and help out around the house here and there and come see the baby shortly after birth, that is fine as long as you stay in a hotel for that time. We will not be able to accommodate your stay at our house until x days after." Blah blah blah.
It probably won't be one paragraph like above, but more a conversation. But have him write down the points you two want to focus on.
-Hotel before and during birth and x days after
-Who's allowed at the hospital/in the L&D room during birth
-When she's allowed to come stay at the house
-Anything else you want addressed.
My MIL currently lives in our town. She doesn't know this yet, but she will not be coming to the hospital after we have the baby. She will be informed and invited to come visit once we're home. We aren't telling anyone when baby is born until we are home, except my friend looking after my kids and possibly my parents because they are travelling from out of town and haven't decided if they are flying (so would have to book flights) or driving (2 day drive).
My parents were originally going to bring up their trailer and camp for a few weeks around the Due Date but for various reasons decided against it. My mom then asked if they could stay at our house (lots of room, even a dedicated guest room) when they come visit a couple days after the birth. And I told her no way. She can stay in a hotel if they aren't bringing the trailer. I love her, but there is NO WAY that I want visitors (even my mom) in my house for the first few weeks after birth. Any other time, they are more than welcome to come visit and stay in our house, but NOT just before, during or just after labour/birth.
We haven't always had a great relationship but with lots of boundary setting and work on the relationship I can set these boundaries and she is respectful enough to listen without being hurt.
My MIL, well my husband will deal with her when the time comes. If she was to ask me outright if she could be there, I would tell her no. "No" is a complete sentence and as such needs no qualifications. Just "No" should work in a respectful relationship. And then I would tell her that we will call her when we are ready for visitors and that will most likely be shortly after we are home from the hospital. If she wants to complain that would when I would let DH handle it. She hasn't brought it up and neither DH or I are looking for a fight, however we've made sure our wording up until this point has been pretty clear around the subject.
I will in fact be letting the hospital know that I don't even want her on hospital grounds, unless or until I decide otherwise, at all during labour/delivery or postpartum stay. And my DH also knows that this is one of his duties to help enforce. We live in a really small town so it would be easy for her to drive by the house, see our car gone, drive by the hospital and spot it without even going into the lot... so simply checking in as a confidential patient and not telling her will not be enough.
So have the talk with your DH, figure out the boundaries you want to set, make sure he will enforce them. Write down the talking points if need be and then move on and enjoy the last little while of being pregnant