Inclusion Criteria:Healthy females: 1) 18 years of age or older, 2) requesting an elective termination of pregnancy by medical abortion, 3) with an intrauterine pregnancy no more than 63 days gestation on the day of mifepristone administration as documented by endovaginal ultrasound, 4) willing and able to sign informed consent, 5) willing to comply with the study protocol and visit schedule, 6) willing to have a surgical abortion/D&C if indicated, and 7) with easy and ready access to a telephone.

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Exclusion Criteria:1) ultrasound evidence at the evaluation(s) prior to mifepristone treatment of an early pregnancy failure, 2) contraindication to mifepristone (known allergy to mifepristone, chronic corticosteroid administration, adrenal disease), 3) contraindication to misoprostol (glaucoma, mitral stenosis, sickle cell anemia, poorly controlled seizure disorder, or known allergy to prostaglandin), 4) known or suspected extrauterine pregnancy, 5) known or suspected pelvic infection, 6) hemoglobin <10 mg/dL, 7) known clotting defect or receiving anticoagulants, 8) cardiovascular disease (angina, valvular disease, arrhythmia, or cardiac failure), 9) current breastfeeding, 10) pregnancy with an IUD in situ, 11) current use of any experimental drug, 12) suspected or confirmed endometrial arteriovenous malformation, 13) active oral herpes lesions per subject report, 14) prior participation in this research study, or 15) current participation in another research study that, in the opinion of the investigator, would interfere with the conduct of this study.

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