Infertility Support Group
In vitro fertilization is one of the most common and utilized ways of treating conception problems. This support group is dedicated to those beginning their journey with IVF and needing support. Join the community and share your experiences, advice, and story with people going through similar challenges starting a family.
http://jackielopina.wordpress.com/2011/09/10/loving-your-friend-through-infertility-recap/
I also had a man in my office who knew my infertilty struggles tell me all about his "fertile mertile" wife and how they had a hard time NOT getting pregnant. Never tell an infertile woman that!!!!
Also, if you're fertile, telling an infertile that you'll carry their baby if needed is not helpful! Or you'll be their donor. Let us approach you if that's really something we are thinking about. I'm not sure that's relevant to your MIL but oh well!
http://www.genea.com.au/Library/Been-trying-for-a-while-/Infertility/A-guide-for-family-and-friends/A-guide-for-family-and-friends