Ectopic pregnancy is abnormal condition in which implantation of the blastocyst occurs outside the endometrium of the uterus. It is of gynecological importance, particularly in the developing world, because of the associated enormous high morbidity, during the first trimester of pregnancy. A better understanding of its determinants can help to prevent its prevalence. This book explores determinants of ectopic pregnancies. Current reaserch is organized after reviewing different literature's so that it can either be read cover to cover for a comprehensive tutorial or be kept desk side as a reference to the ectopic pregnancies.