I'm going to go out on a limb here and say I'm a little sad to see all the comments that lump every mother together into this zombie-mommy image that loses all sense of her personality and self-worth. I feel like anyone who undergoes an immensely huge life-change talks about it non-stop. Kids who just started college will pretend to know everything about political science or whatever. Newlyweds give marriage advice to anyone who will listen. Someone who just bought a fancy car all of a sudden finds a way to always bring up the car. Having a baby is a huge life event, people are going to talk about it.
Now before you get out your pitchforks and turn on me (if you haven't already) I'm not excusing the behavior. I'm not saying it isn't fucking annoying. I'm also not saying it isn't extremely insensitive especially when the person knows they are speaking to someone who is having fertility problems.
LongLiveTea, you are NOT over-reacting because like any topic it reaches a saturation point. If someone talked about how amazing their new iPhone was in every conversation, we'd feel more comfortable being like "We get it, you love your phone. Now drop it." But because it's children, it's harder to say that without coming off like a hateful person.
Society works hard to make women feel like crap for not spending enough time talking about, caring for, and being with their children. Look at how it makes us feel when we can't have them. Look at how many blogs and websites are all about how you have to "stimulate their minds" or you are neglecting them, putting them at a disadvantage, not loving them enough. Look at women who get shat on for admitting they don't want to be stay at home moms and would rather work.
This has gotten really tangental and lengthy - I don't know why I'm so angsty today, probably because I was reading about NC's bathroom nonsense again - so I apologize.
I think you should definitely tell your friends to cool it with the baby talk and/or remove yourself from the conversation for a while. I'm guessing eventually it will divide out into those who want to talk about kids all the time and those who really appreciate the chance to have conversation about something else.