Losing friends when engaged married or pregnant

I noticed that the second I got engaged my friends suddenly didn't wanna be around me that much anymore and when I got married I lost a lot of friends. Now that I'm pregnant I only really have 2 good friends and they even seem to be acting strange. Has anyone else gone through this? It's really kind of depressing when I think about it but I'm happy I have my husband to help me get through it all.