What would you do?

So I booked a room for me my boyfriend his 2 kids and paid for it just for something fun for us to do and his kids have been wanting to go somewhere. Well my bf decided to invite his mom to come with us fine but there are only 2 beds in the room and he said they don’t wanna get an extra room I asked him where everyone was sleeping and he said 1 of his kids will sleep with his mom and 1 will sleep with him and I can get a cot or sleep on the floor? I am 6 months pregnant and do not wanna do either i am so annoyed especially because I am paying 400 dollars for this room. am I over reacting ?