Comment by lz400

In the book she has no choice, knowing the future doesn't allow you to change it, it's deterministic. Free Will doesn't exist. In the movie they went out of their way to make it clear the future can be changed, and she does change it with the phone call. Which undermines the much cleaner scientific premise of the book and also makes her a bit selfish to decide to have the child anyway and only tell her husband months before she gets sick.