Effectiveness of Anti-Inflammatory Drugs for Preventing Pain Versus Treating Pain During Medical Abortion From 13 to 22 Weeks at Hung Vuong Hospital

Inclusion Criteria: * Pregnant women aged 18 years or older. * No mental illness. * Gestational age between 13 and 22 weeks (based on the last menstrual period with a regular menstrual cycle and accurate recall of the last menstrual period, or based on a first-trimester ultrasound) with an indication of stillbirth, fetal malformation requiring termination, or voluntary abortion with counseling and understanding of the abortion procedure. * Willing to participate in the study. * Capable of reading and signing the informed consent form. * Able to provide personal information independently. Exclusion Criteria: * Medical conditions contraindicating medical abortion: bleeding disorders, anticoagulant use, moderate to severe anemia. * Cardiovascular conditions: heart failure, mitral valve stenosis, embolism, uncontrolled hypertension. * Other medical conditions: renal failure, adrenal gland disorders, severe asthma, liver and biliary diseases, glaucoma. * Active pelvic inflammatory disease or acute genital infections. * Previous uterine surgery. * Placenta previa or central placenta previa. * Uterine malformations. * History of allergy to NSAIDs, Mifepristone, or Misoprostol. * Unwillingness to participate in the study.