My girlfriends seem to be turning on me now that I'm pregnant?

At first I thought this was in my head, or maybe that I was just hormonal, but sure enough everyday I'm getting snappy or smart responses, and some of them have stopped talking to me altogether. I haven't been rude to any of them, so I don't get it. Sure I have less time and energy to chat on the phone etc, but this is getting out of hand. Has anyone else had this experience? What is the deal here?