The two walk into the maternity area of the department store... It isn't a large are, there's some maternity dresses and other clothes, and a few other items.
Bill picks up a book. The title of the book is just "The Plan", which tells him nothing about what's inside the book, so he opens it. The title page reads "The Plan: The Three Trimesters of Pregnancy".
It figures, he thinks. He decides he doesn't need the book and tries to close it, but for some reason the book won't close. He turns a page and finds himself involuntarily reading the words. The book begins to explain that a pregnancy happens inside a female organ called the uterus.
Suddenly Bill gets a peculiar feeling in the whole area of his body from his belly to between his legs.
The book describes the first trimester--the first three months. Bill tries to close the book but instead finds himself reading. When he's done with that section, he gets a bloating sensation and his belly is beginning to expand...