Have you lost friends along the way when dealing with infertility?

After many years of infertility I've noticed the people I call friends... are really no longer my friends.  They all have a baby or babies.  I remember the last time we all had dinner a year ago, I realized I was the only childless woman there.  They were all chatting it up about their kids and I listened and tried to chime in once in awhile.  It was obvious I no longer fit in anymore.  I recently found out a friend had a big birthday party for her son and saw that everyone was invited ...except me and DH.  It was quite hurtful to say the least.  Unfortunately I have to see this friend in a couple weeks ... Not sure how to go about being around her. 😞