Hello dear I understand your concern If you had taken nordeette pill in correct dose and way then it is 85% effective in preventing pregnancy. Correct dose: 4 pill as early as possible and another 4 pill after 14 hours to prevent unwanted pregnancy. But there is 0-15% chance of pregnancy. But Pill itself cause delay in period by 1-2 week as it cause hormonal imbalance. Pregnancy test will give positive test only 7 days after delayed period. So wait for period. If period will delay by more than 2 weeks then consult gynecologist to confirm pregnancy. Meanwhile avoid stress, take healthy diet, drink plenty of water and do regular exercise Hope this may help you Best regards Dr. Sagar