###Human: What is the chance of pregnancy after taking ECP? ###Assistant: Hi. The success of emergency contraceptive pill (ECP) like an I-pill or unwanted-72 remains 99 percent when the withdrawal bleeding is experienced within next 5-7 days thereby ruling out pregnancy completely due to shedding of endometrium. Another option besides ECP is to use an intrauterine contraceptive device like copper-T within 72 hours of intercourse which can again prevent pregnancy and it is also 98-99 percent successful but not advised for women who have not delivered yet. For further information consult an obstetrician and gynaecologist online -->