Relationship between signs and symptoms of early pregnancy and pregnancy loss

Vaginal bleeding is associated with increased incidence of early pregnancy loss, with more severe bleeding and bleeding accompanied by lower abdominal cramping associated with greater incidence of loss; conversely, vomiting is associated with decreased incidence of early pregnancy loss, even in the setting of vaginal bleeding, while nausea alone is not.

Human Reproduction, 03/04/2016Sapra KJ, et al.