Hi, some time in the last year I read a book that I think was set in the U.S. about a teen girl that was pregnant without intercourse. Through the story she finds that the Earth wants to replace humans with a new species (her) that will all be self producing pale females. She and her daughters would end up spontaneously producing 12 children each, 1 every 3 years. When she overhears "friends" discussing whether they should try to save humanity by getting rid of her, she leaves town to live with an aunt then marries an older man to provide a father (cover) for the children. Does anyone else recognise this? I've been trying to find it everywhere but can't remember what it was called or who wrote it.