Can you bring anyone as a wedding guest?

Livi 🦊
My SO and I have only been together for 4 months. But we're pregnant & discussing marriage in the near future. It's wedding season, as you know and he only RSVP'd himself to attend his friends wedding because "it isn't proper etiquette to invite someone no one knows and you've barely been with". But I was planning on taking him to my best friends wedding only 2 weeks after his friends wedding and think it's fine because it isn't like I'm just up and running anytime soon. Right? I mean, we're in this for the long haul now. And besides, by the weddings I will be showing and everyone will know. Further discussion with my parents led me to believe that some people even just bring friends or something so they aren't alone at weddings so it really shouldn't matter then. So my question is is it okay to bring anyone you want to the wedding as your wedding date? Thanks!

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