Needing advise, please!

I have wonderful mother-in-laws (one is my husband's mother and the other is his step mother). They are truly amazing and I love them. I am 23 weeks pregnant and they are SO excited, which I am happy for. My problem is--they both have invited themselves into my birthing room when the time comes. His step-mom is a delivery nurse and has said on multiple occasions that she hopes she is working when I go into labor, and every time she brings it up my husband says something along the lines of "Stacey hopes you aren't" and then she replies with "oh I will just be there taking pictures, I won't actually be her nurse". If I have her in the room, then I also have to let his mom and my mom in the room for fairness. While his mother hasn't actually said anything to me about being in the room, I just found out from his grandma that his mom is expecting to be in there 😩

 I am very modest and don't feel comfortable having anyone in the room while I am in labor. Truthfully, if it weren't ridiculous, I wouldn't even let my husband in the room. I don't want them seeing my vagina all stretched out and bleeding and all the fluids and possibly poop...it's just so embarrassing and uncomfortable to me, and the last thing I want to be worried about while going through all that comes with labor, is the fact that my mother-in-laws are in there seeing all of this.