Going out with friends when you're 21, and 5 months pregnant

We had a get together last night

Everyone including my boyfriend wanted to stay out til 3am drinking and partying

I'm sitting over here in a corner, fat, tired, out of breath, and too hot from all the people.

I'm not having any fun at all.

And I can't get my boyfriend to understand that when I say I wanna go (at nearly 2am), I'm not trying to ruin his fun, I'm just exhausted and I need to sleep and am getting cranky because I'm not having any fun surrounded by 30 drunk people.

But we always go and do what he wants.

And then when I wanna do something that's fun for a pregnant lady, like go to the movies or the zoo or bowling or something, that's boring to everyone.

Any advice?