Janet, you know I am in a similar situation. One thing I have gleaned - don't make any choice until you are certain that is the option you WANT. Infertility in and of itself isn't enough reason to adopt. You have to genuinely want to adopt. Same with making a decision to pursue treatments, or a decision to not have children. Any of those choices have to be the choice that you are ultimately going to be okay with.
There is a book I read and recommend called Navigating the Land of IF. I highly suggest you read it before you make any decision one way or the other. I also suggest that you not go to the adoption classes until you know it is what YOU want, and not what your mother wants. Because you are going to be the one staying up nights with the adopted child, not your mother. That book will give you some frame of reference for all of your options.
Me (40) DH (47) & furbabies * m/c 7/08 4/12 11/12