It is normal to experience changes in your menstrual cycle when taking contraceptive pills like Linessa. Missing a period or having irregular periods is a common side effect, especially in the first few months of starting the medication. It is important to continue taking the pills as directed, even if you experience symptoms like stomach pain, diarrhea, increased appetite, or nausea. If you have concerns or questions about your symptoms or the effectiveness of your contraception, it is recommended to consult with a healthcare professional or pharmacist for personalized advice.