Sorry to hear you're feeling like this. I know exactly where you're coming from as I am feeling and thinking similar things at the moment! It seems to be a sad fact that some friendships seem to turn a bit odd when one of you becomes pregnant, maybe because people assume that you have more important things to do and think about and your life is moving on - and they neglect to realise that it's at this time you need friends more than ever! But agree with PP that true friends will understand and make time for you - although maybe they need a nudge in the right direction.
It has happened to me, and I have been quite upset about it, and I do think that I take it out on DH a bit. But that's also because he is incredibly busy at the moment trying to make our dilapidated house habitable, and as much as I try to explain that we need to spend more time together, there is always something more urgent for him to do.
What I have tried to do is explain to a couple of my most trusted friends how I am feeling, and just talking about it has made me feel better - like the PP suggests, you could try this. As for DH, I'm just hoping that things will change as the house gets sorted and when the baby arrives. You already know this, but our pregnancies can have strange effects on our men folk as well, and in typical male style they can go in on themselves and seem to want to spend more time with their friends than with us. If your OH is anything like mine, it's probably not that he doesn't care, it might be that he's dealing with the thought of becoming a father - and all the worries that go with it - in the only way he knows how. It can be so hard to get them to open up, and we resort to 'chasing' them out of frustration.
Maybe you could try asking him how HE feels about the pregnancy and the baby - not in a pushy way, but in a caring way that shows you are interested in him and the way he is feeling. THis can be hard to do sometimes when you're the one carrying the baby and you need support that he doesn't seem willing to give you sometimes, but I've found that my DH responds much better to this kind of approach than any other, and it makes a change from me banging on about how I'm feeling. Don't forget that a lot of the time, people (including his friends, probably) will ask HIM how YOU'RE doing too - and I know this has got to my DH in the past - ("why does no-one care about meeeeeeeee??!!!")
Anyway, I've rambled on long enough - hope you feel better soon and you two can work through it and come out very happy and strong on the the other side.
xxxx