Hello dear I understand your concern It is too early to tell about the pregnancy because absence of the period is the definitive sign of the pregnancy. Nausea,severe mylagia, high fever, severe headache are also rare after using the I pill. I think it could be due to malaria, dengue, typhoid, viral infections. I would suggest to concern primary physician and undergo blood tests like CBC, ESR, malaria tests and vidal test. Take tablet diclofenac plus paracetamol Tablet pantoprazole plus domperidone Take bed rest Drink plenty of water and take healthy diet Other treatment will depend on the cause. If your period will delay by more than 10 days then you should think about pregnancy. Hope this may help you Contact HCM for further health query Best regards Dr. Sagar