Pregnancy and feeling left out

One of the worst things in being the first one to have children in your group of friends - you get completely left out of everything they're planning, unless you're willing to be driving them around the city while they drink and have fun. Our friends are 18-24 years old and all still studying and pretty much everything they do involves alcohol. Obviously, my SO can drink so he's invited everywhere, but I'm being completely left out. I'm so happy to be pregnant, I want nothing more than to start a family with my man, but I also feel so sad that no one wants to spend time with me anymore. I'm just not fun or interesting to be around. Even my SO seems to have so much more fun with everyone else but me. 😢 He does spend time with me but I sometimes feel that he does it only to keep me happy, not because he enjoys my company... Sorry for the sad rant but my SO's going out soon and he of course has the right to do so, but the loneliness is just getting to me tonight. 😞 Anyone else having similar feelings?