<unk>  is the natural or spontaneous end of a pregnancy at a stage where the embryo or the fetus is incapable of surviving, generally defined in humans at a gestation of prior to 20 weeks.<unk>  is the most common complication of early pregnancy. The medical term "spontaneous abortion" is used in reference to<unk> s because the medical term "abortion" refers to any terminated pregnancy, deliberately induced or spontaneous, although in common parlance it refers specifically to active termination of pregnancy.
Miscarriage
Stillbirth
Multiple birth
Unwanted pregnancy
Preterm labor
Premature birth
Preterm labour
Maternal death