OK, assuming you're a new poster and you're not used to the bluntness of AIBU.
YABU, but understandably. You are pregnant, DP isn't, and as others have said, it's not really on to restrict him from his normal life for the full 9 months. If he gets pissed every night, you've got a bigger set of issues.
I'm 20 weeks pregnant with our first. We both go out less than we did before, because DH wants to spend time with me as well as with his friends, and I don't enjoy going out "drinking" when I can't drink. The last time we went to a gig, the vibration from the speakers made me feel sick. However, he still goes out without me sometimes, and I enjoy a night in with the telly or a good book.
He's changed his habits a bit, but the real change for him will come when the baby arrives (he's turned down a works jolly abroad when I'll be 37 weeks - I'd have been happy to take the risk, it's only a short flight and a first labour could easily be late and long, but he didn't want to chance it), whereas for me, the first real change happened when I got pregnant.
If he's thoughtful and considerate in other ways, a few beers won't do him any harm. You'll soon get used to it. I gather you're not very far gone.
And don't be put off by the flak you've taken - get to know the way people write on here, maybe namechange and dive back in. Usually if people are mean, you kind of deserve it - I know I did.