Hi guys - I'm so sorry, Jodie, that your friends are being crap.
When I was 21 I was in the friend's position - my best friend became pregnant, it wasn't quite the same as we'd just graduated so we were at the other ends of the country anyway so wouldn't have really been meeting up regularly.
But I do remember feeling a bit insecure about it - it's a huge change to the dynamic of your friendship and I felt as though I was going to be left behind a bit. Fortunately I got over myself and (hopefully) didn't let it show, and we're still friends (cough) 14 years later.
If your friends really are being rubbish though, perhaps your best bet is to deal with them one-on-one, rather than as a group. As you get more knackered with the pregnancy you'll be more able to do that sort of thing anyway. How about things like the cinema, where it's not all based around booze?
And also - it is the case that some friends don't make the distance. As Erika says, you'll meet lots more people at things like mother and toddler groups.
As far as the baby's father goes, you may need to wait a bit. It probably won't seem real until there's an actual baby - he won't be going through everything you are so it's easy for him to pretend it's not happening. Don't let him bully you though, that's disgraceful.