The hallmark symptom of miscarriage, also known as spontaneous abortion or early pregnancy loss, is vaginal bleeding. The bleeding may be very heavy, and blood clots and/or tissue may be passed along with the bleeding. The bleeding is usually accompanied by abdominal pain and cramping. The pain may radiate to the low back, vagina, pelvic area, or buttocks. Fever and chills are not common but may occur if the miscarriage is a result of an infection.