Hello, Thanks for posting your query. The emergency pill contains high dose of progesterone and this is the cause for the early or withdrawal bleeding you experienced. The hormone imbalance created is likely to be responsible for the persistent spotting. The altered color of the discharge suggests old bleeding which is retained in the uterus. Some breakthrough bleeding also is a possibility and is presented similarly. You can also expect your next natural period to get delayed by a week or two. I would ask you to see a specialist for further appraisal of the situation and plan proper management. Please restrict the use of the emergency pill to once or twice a year. Hope this helps.