As a person living in Middle East, I think the meaning and conception of a movie or many other forms of art is personal and depends on many different elements such as place of living, conditions growing up and overall, the meaning of life in general (we call this "geographical force" or "Jabr e Joghraphia" in Persian).
I live in Iran and as you may know, we have many limitations regarding politics and personal freedoms. Being pro-life or not doesn't have significant value in my moral system. It is just choices. In my opinion, the concept of this movie is about choices that we all take regarding different aspects of our lives. THE CHOICE. Our awareness prior to our choice, its consequences, our information regarding these consequences and inevitability of these consequences. I think the important question is: would we make the same decisions if we knew for sure the consequences?
I think Amy Adams' character may or may not be pro life, but she just made a decision and decided to bring someone to this world that she knows she will have cancer (or some other incurable decease) and she will be dead in young age, but she chose to taste the motherhood, its joy, and she wanted to start a journey and she know that it would end in sad situation. I think she made a choice just for herself, not thinking about husband or the child herself, and I admire her for that. Sometimes self-centered decisions may add some value in our lives but it takes more discussions way more complicated.
The movie may share a pro-life message, but I think it's whole concept built on the importance of choice.