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

The goal of this clinical trial is to assess the effectiveness of non-steroidal anti-inflammatory drugs (NSAIDs) for prophylactic pain relief compared to on-demand pain relief during medical abortion for pregnancies between 13 and 22 weeks at Hung Vuong Hospital in Ho Chi Minh City. The main questions it aims to answer are: 1. Does prophylactic use of NSAIDs reduce pain compared to on-demand use during medical abortion? 2. What are the potential adverse effects of NSAIDs in this context? Researchers will compare a group receiving prophylactic NSAIDs to a control group receiving on-demand pain relief to determine if the prophylactic approach leads to improved pain management outcomes. Participants will: * Be given NSAIDs either as a preventative measure or upon the onset of pain. * Be monitored for pain levels using validated pain scales, any side effects, and outcomes of the abortion procedure.