What is a miscarriage ? A miscarriage is a loss of a pregnancy. The term is generally used when the loss occurs before 20 weeks of gestation. Other terms that are used for such losses include spontaneous abortion and early pregnancy failure. About 15% to 20% of known pregnancies end in a miscarriage . Most miscarriages happen before the pregnancy is 12 weeks along. In the first several weeks of a pregnancy, a miscarriage sometimes happens because a fertilized egg did not properly form a fetus ... A miscarriage is the loss of a pregnancy before 20 weeks’ gestation. Learn about the types, causes, symptoms and treatment of miscarriage , and how to cope with this common pregnancy complication. An overview of miscarriage (early pregnancy loss ), including aetiology, clinical features (symptoms, signs) investigation and management. Learn about miscarriage , its signs, causes, types and treatment. Get recovery tips, emotional healing and when to try again after a pregnancy loss.