Best way to make mommy(or mommy to be) friends?

Long story short, I live really far away from my family and friends, husband works nights and me days. When I see him I try to let him know what's going on but to him it just sounds like I'm miserable and complaining all the time (which I'm not but I can see why he might feel that way so I've got to reign that in).

The other day I saw a lovely group of perfectly pregnant ladies all at lunch together, a few toddlers in tow. It made me realize just how isolated I am.

So what's the best way to connect with other mommies in general? I'm looking into finding a prenatal yoga class but would love some more suggestions.

Thanks!