Do you belong to a "moms' group?"
I'm a member of our local chapter of The Mommies Network. It's free to join and I've made a lot of new friends through it. I joined when I was pregnant with Connor. There's events each week and at least one mom's night out each month! It's awesome, I don't know what I would have done without them!
I was also a member of a different local moms group on meetup.com. It was a $10 fee to join, and they did a TON of events each week. But I found they weren't as friendly, accepting, or open. I only went to a few events and felt very much like an outsider, not welcome. So I left that group!
When I was pregnant, we took a Bradley Method childbirth class.