Oh my, I would say you are totally best off finding out she is like this now rather than later! It's sad, but as others have said you willl make so many new friends once the baby is here. It does take effort, you have to go to groups and chat to strangers even if it seems daunting at first, but it will be your lifeline!
I do believe it's easy to get carried away when you are pregnant, especially with your first. It's the biggest thing tjat has ever happened in your life, but for other people it is just 9 normal months. The beginning is exciting, the end is exciting, the rest not so much. Their lives continue and especially if they are not in that 'place' they won't want to be talking just baby.... Although we can find it hard to relate to much else!
There is that saying about fun used to be nights out, getting drunk and sleeping in till 10. Once you have kids fun is hunting for sticks, blowing bubbles, snuggling up to watch Disney and sharing giggles at 5 in the morning. It's so true, you just need to find friends who have the same new fun as you will x