The clear enthusiasm of clinicians and scientists engaged in early pregnancy care and research has been the springboard for the launch of this first book on early pregnancy. Authors from international organizations such as The European Society for Human Reproduction and Embryology (ESHRE), The American Society for Reproductive Medicine (ASRM) and the Royal College of Obstetrics and Gynaecology (RCOG) have been brought together through several fascinating and engaging meetings as the burgeoning area of early pregnancy research has “come of age” and matured into sentinel areas of basic science research and evidence-based practice. In professional terms, early pregnancy sits between fertility practice and obstetrics. Early pregnancy has become an expanding area of research for embryologists, geneticists, endocrinologists and ultrasound experts plus many related core specialist areas. It truly requires a multidisciplinary team, both at the bench and at the bedside, who can work together to translate the exciting new developments in the field into clinical practice. The editors are indebted to all of the authors for their contributions in the field of early pregnancy and for writing chapters on their unique expertise. Their enthusiasm has made the production of this book much easier than anticipated.