Vaginal bleeding in the first and second trimesters of pregnancy.
D005260:Female; D006801:Humans; D011247:Pregnancy; D011249:Pregnancy Complications, Cardiovascular / Q000175:diagnosis / Q000209:etiology*; D011261:Pregnancy Trimester, First; D011262:Pregnancy Trimester, Second; D014592:Uterine Hemorrhage / Q000209:etiology*