Hello dear I understand your concern I pill is 95 % effective in preventing the pregnancy as you had taken within the 24 hour of the sex. So there may be 0-5% chance of the pregnancy if you had sex in the fertile phase of the cycle. Following are the side effects: Delayed/earlier period, excessive bleeding, hormonal imbalance, ovarian hyper stimulation and infertility problem on regular use. Do not use I pill as regular contraception. If your period will delay by the 12 days from the normal expected period date then go for urine pregnancy test and or blood HCG to confirm the pregnancy. If you will be pregnant then intrauterine pregnancy will be terminated by the abortion pill under the advice of gynecologist. Abdominal cramp may be due to side effect of the I pill. Take bed rest and tablet meftal spas Drink plenty of plenty of water and take healthy diet. Hope this may help you Contact HCM for further health query Best regards Dr. Sagar