Hello dear I understand your concern Most probably your period is delayed by the hormonal imbalance caused by the emergency contraceptive pill. Other cause could be stress, change in lifestyle, and dietary habit, thyrpid dysfunction Wait for period to come for next 4-6 days. If it will not come then consult the gynaecologist and undergo examination , reproductive and thyroid hormone analysis, USG scan to confirm the cause. Period can be induced by the progesterone pill. Meanwhile avoid stress, take healthy diet, drink plenty of water, do regular exercise. Best regards Dr. Sagar