Leaving Normal by Stef Ann Holm

Divorced and the mother of a college-bound daughter, Cassie, Natalie Goodwin prepares for her new life in the dating world. Just before Christmas, Natalie becomes friends with Tony Cruz, her neighbor from across the street who also found himself recently single. They hit it off, but Natalie's refusal to have another child, which Tony desperately wants, puts a halt to their relationship--until her daughter comes home from school alone and pregnant, and gives them the opportunity to have everything they want!