Overview. Miscarriage is the spontaneous loss of a pregnancy before the 20th week. Miscarriage is when an embryo or fetus dies before the 20th week of pregnancy. Miscarriage usually happens early in your pregnancy — 8 out of Miscarriage, also known in medical terms as a spontaneous abortion and pregnancy loss, is the natural loss of an embryo or fetus before it is able to. The most common sign of miscarriage is vaginal bleeding. This can vary from light spotting or brownish discharge to heavy bleeding and bright-red blood or. A miscarriage is the loss of a pregnancy during the first 23 weeks. The main signs of a miscarriage include vaginal bleeding, followed by cramping and pain. A miscarriage is the loss of a baby before the 20th week of pregnancy. The medical term for a miscarriage is spontaneous abortion. Inevitable miscarriage. Inevitable miscarriages can come after a threatened miscarriage or without warning. There is usually a lot more vaginal bleeding and. A miscarriage, also called a spontaneous abortion, is the unexpected ending of a pregnancy. About 1/3 to 1/2 of all pregnancies end in. Miscarriage (also called early pregnancy loss) is when a baby dies in the womb (uterus) before 20 weeks of pregnancy. For women who know they're pregnant, about. A miscarriage, or spontaneous abortion, is an event that results in the loss of a fetus before 20 weeks of pregnancy. It typically happens.