A 23-year-old woman who is 6 weeks pregnant has noticed slight vaginal spotting and her period is 2 weeks late. The differential diagnoses in this case are threatened miscarriage, ectopic pregnancy, or molar pregnancy. Ultrasound would be helpful to locate the pregnancy and assess viability. Serial beta-hCG levels and progesterone levels could also help predict the pregnancy outcome if the location is unknown. Surgical uterine evacuation may be needed if bleeding is excessive or the woman prefers it.