What is threatened abortion? Threatened abortion, also known as early miscarriage, means that a pregnant woman has abdominal pain, diarrhea, vaginal bleeding and other symptoms within the first three months of pregnancy, but the fetus still keeps a heartbeat and does not miscarry. At this stage, if timely measures are taken, complete miscarriage can often be avoided. But if it cannot be controlled, it will lead to fetal death and miscarriage. What symptoms indicate the possibility of threatened miscarriage? Threatened abortion is very common in early pregnancy, and its symptoms mainly include the following: 1. Abdominal pain: short duration and mild in severity