Yes, the i-pill (levonorgestrel) can cause mild, temporary side effects even if a woman is not pregnant. In fact, it is designed to be taken when not pregnant to prevent pregnancy. Common temporary symptoms include nausea, fatigue, headache, breast tenderness, or slight changes in the next menstrual cycle, such as spotting or a slightly early or delayed period. Please be reassured that these symptoms are very common, harmless, and typically resolve on their own within a few days. If you experience severe abdominal pain or if your period is delayed by more than a week, it is best to consult a healthcare professional.