Hallow Dear, Emergency contraceptive pills contain some Progestational preparations. They are known to cause nausea, vomiting, acidity like gastro-intestinal disturbances. They are causing gases, pain in abdomen, etc.. Some proton pump inhibitor antacid like will help you control these symptoms. You may try Pantoprazole daily for about a week or so. Being Progestational medicine, few days after consuming the pills, some amount of bleeding is known. It usually lasts for about a day or so and then stops by itself. It is not an issue of concern. I hope this helps you. Dr. Nishikant Shrotri