Friends drifting away as I'm pregnant?

Hi, my friend and I have been close for many years. We went everywhere together at school and were each other's chief bridesmaid when we got married, but things have changed. She lives an hour away now but we never see each other, or even speak that much. She has a busy social life and is career driven, like her husband and doesn't want kids yet; whereas I am family driven. I am now pregnant with my first child and I thought she would be excited, but she doesn't seem that interested. She said she was excited and I know pregnant women have a habit of harping on a bit, but I wanted to be able to talk to her about it. I'm the first of us friends to have a baby- it's exciting but also nerve wracking, especially when your body changes so much. We used to share everything but things have got a lot worse since I became pregnant. I feel like I've committed a crime! It was only recently she was checking out her own maternity policy at her new job and sounding broody, but now she's adamant she doesn't want them yet. I respect her choice and know friendships change, but I didn't think we'd drift this much. Anyone else ever had a similar problem?