A few of my single friends have dropped me, too. I think for a lot of people it's hard to separate the woman from the pregnancy (and maybe later, from the motherhood), so that single friends feel like they can't or don't want to relate on a personal level anymore.
I know it seems cruel, but I was on the other side of this myself a few years ago. I became pretty good friends with a woman who was my husband's friend from childhood, and she got pregnant. When we would all hang out, she would turn in at 9 o'clock, so get-togethers became a little more awkward. And suddenly her pregnancy and baby became part of most conversations -- it wasn't obnoxious, but it was, of course, on her mind a lot. Suddenly I felt like the woman who was NOT going to be a mother, and while I know that perception was my problem, not hers, it nonetheless affected the way I acted around her and the amount of time I subsequently spent with her.
I think that we still tend to view a woman's baby-carrying as a mystery, and as something amazing and special. And it's hard to relate to someone who is mysterious and amazing and special, especially when your own life is clipping along in its ho-hum existence.
It wasn't until I got pregnant myself that I really examined my own behavior, and let me tell you, I called this woman right away to reconnect, tell her I was pregnant, and chat away about foggy brains, cravings, fatigue, etc. Maybe the friends who aren't around now will come around later, or maybe it's better that they left your life now -- sometimes I feel like friends get "weeded" out of our lives for good reasons.
