Bumped

Bumped is a 2011 novel by Megan McCafferty. When a virus makes everyone over the age of eighteen infertile, would-be parents must pay teen girls to conceive and give birth to their children, making teens the most prized members of society. Sixteen-year-old identical twins Melody and Harmony were separated at birth and had never met until the day Harmony shows up on Melody’s doorstep. Until now, the twins have followed completely opposite paths. Melody has scored an enviable conception contract with a couple called the Jaydens. Harmony has spent her whole life in religious Goodside, preparing to be a wife and mother. She believes her calling is to convince Melody that "pregging" for profit is a sin. But Harmony has secrets of her own that she is running from.

A sequel titled Thumped is planned to be released April, 2012.

Tropes:
""No, it's the third sister, Symphony. And I've got two others at home called Rhythm and Tempo.""
 * Absurdly Youthful Mother: Melody meets a pregnant surrogate mother who is eleven years old.
 * All Guys Want Cheerleaders: The Cheerclones.
 * Alpha Bitch: Ventura Vida, Melody's rival for president of their school club, who often makes snide comments about Melody's being the only non-pregnant girl in the club.
 * Ambiguously Brown: A security guard at the hospital, who has slanted green eyes, brown skin and a blond Afro. This is said to be very common among older people.
 * Ambiguously Gay: Harmony's husband Ram.
 * Arranged Marriage: In Goodside, girls are married off at thirteen. Harmony broke off her first engagement; at sixteen, marrying Ram is considered her last chance at a respectable life.
 * As the Good Book Says...: Harmony often quotes Bible verses.
 * Babies Make Everything Better: Subverted hard with cases like Melody's friend Malia, who had a mental breakdown after her child was taken away, or with, whose pregnancy by   opens up a whole new can of worms - hopefully to be addressed in the sequel.
 * Childhood Marriage Promise: At twelve years old, Melody and her best friend Zen promised that if no one else turn up, they would conceive a child together. Zen still takes the promise seriously, but Melody laughs it off.
 * China Takes Over the World: China is said to be on its way there.
 * Cult: Harmony is part of the Goodside cult, which is more or less like future Amish.
 * Death by Childbirth:
 * Doting Parent: Jondoe's parents.
 * Dystopia
 * Everyone Can See It: Melody and Zen. Shoko teases her about making him her "everythingbut"; Harmony mistakes him for Melody's sperm donor; even her parents are suspicious.
 * Fawlty Towers Plot: Harmony answers the video phone for a sleeping Melody and is mistaken for her by Lib, Melody's Large Ham of an agent, who called to hook up his client with sperm donor Jondoe. Harmony, a sheltered country girl overwhelmed by Lib's pushiness and Jondoe's beauty, ends up impersonating Melody almost despite herself.
 * Free-Love Future: For teenagers at least; adults are implied to be more traditional.
 * Future Slang: All slang relates to pregnancy or reproduction, like "ectopic" meaning "lame", "terminated" meaning annoyed and "pregg" meaning baby.
 * Happily Adopted: The family model of the future.
 * Hidden Depths: Jondoe reveals to Harmony that he has his own Christian beliefs, and that he chose his profession out of a genuine wish to help would-be parents.
 * Holier Than Thou: Harmony, though it is revealed that
 * I Love You Because I Can't Control You: Zen, an expert debater, first made friends with Melody because she argued back to him instead of giving in to his persuasion like everybody else.
 * Just Friends: Melody and Zen.
 * Like Brother and Sister: Harmony and Ram, which made it extremely awkward when they became engaged.
 * A Man Is Not a Virgin: In full effect with most teenage boys, especially Jondoe. Subverted with Zen, who is considered an inferior specimen because of his height ("only" five foot seven) and, in some circles, his Chinese/South American DNA.
 * Mandatory Motherhood: Most teenagers are paid top dollar to have children for wealthy couples after the virus makes anyone over the age of 18 infertile. In fact, any form of birth control is illegal. Motherhood is celebrated by everyone, with girls being told that they are born to breed and are even able to wear "practice" bumps as accesories.
 * Memetic Sex God: Jondoe, in-universe, the most sought-after sperm donor in the U. S. or possibly the whole world.
 * Multiethnic Name: Almost everybody. Zen Chen-Chavez, Shoko Weiss, the Ruiz-Lees.
 * Not So Different: Harmony and Melody discover this gradually throughout the book, as the "innocent Church girl"  and the "perfect Surrogette" , both trying to follow their hearts and make their own choices instead of following orders.
 * In a broader view, Goodside and Otherside - they seem like polar opposites (religion vs. science, arranged marriage vs. free love), but the scary thing is that neither of them takes individual choices much into account.
 * Oy Vey: Shoko's Catch Phrase.
 * Runaway Bride: Harmony escapes Goodside on the morning after her wedding, hoping that converting Melody will make up for the fact that she cannot face living with Ram.
 * Separated at Birth: Melody and Harmony are identical twins.
 * Sex as Rite-Of-Passage: Granted, the sex is so you can get pregnant.
 * Sterility Plague: The virus that has made everyone over the age of 18 sterile.
 * Teen Pregnancy: All pregnancies.
 * Their First Time:
 * Theme Twin Naming: Melody scoffs that their birth mother must have been insane.


 * Twenty Minutes Into the Future
 * Twin Switch: Harmony pulls this so she can convert Melody's match Jondoe.
 * Virgin Power: Zen claims it makes him a better table tennis player.
 * "Well Done, Son" Guy: Melody's adopted parents have raised her to be the "perfect" Surrogette: athletic, creative, intelligent and ambitious. She finds the pressure difficult to cope with.
 * Wide-Eyed Idealist: Harmony