Oh goodness. I had the exact same problem when I first told my friends I was pregnant (I’m now in my last 5weeks).
I guess the people who are happy for you, and are still the same, and are excited for you, those are your TRUE friends. Because no matter what, they will always be there for you.
On the other hand, the people who are kinda weirded out, or seem more distant.. Well they should get the boot. Simply because, if they’re not happy for you, then were they ever really happy for you at any other time?
I’ve lost a few friends over me being pregnant, but I moved on. Life is too short to dwell on silly things like that, especially since you learn who’s really going to be there for you when you need them.