Feeling a bit lonely in the friend department 😔

Kaylen
None of my friends are married or have kids. My husband and I are 30 and 29, but we're the first of all our friends to do these things. Over the last 4 years, we've just seen a decline in friends wanting to engage with us or hang, I guess because they're single and doing their thing. Which I absolutely get. I guess it just feels even harder now that we're the first to be starting a family, and no one else is really about that. I've kind of felt lonely throughout this entire pregnancy, friendship-wise. And just feel like, once we have this kiddo, it's probably going to make people distance themselves from us even more. They don't want to hear about "baby stuff" or have our marriage and life "shoved" in their single life faces, as someone said at one point. *sigh* 
We're not "part of the party" anymore.
Being natural introverts has not helped us figure out how to make couple friends or find friends with kids. Is that something that will more than likely happen on it's own once we have a baby? Through groups and kid activites? Otherwise, I know it sounds silly, but we're kind of at a loss for how to make new friends in this new era! Ha. Advice anyone?