Thank you for your question.
Emergency contraception especially the ipill does have its own failure rate and can never be 100% effective at preventing an unwanted pregnancy. The only way to know if she is
pregnant is to do a urine
pregnancy test if the period is delayed by more than seven days. The only way to reliably prevent an unwanted pregnancy is to use a reliable a method of contraception in addition to condoms. There are several highly effective reliable reversible methods of contraception that are readily available in India and are underutilised because of myths in the minds of women. Preventing an unwanted pregnancy is always safer than a termination of pregnancy.
Best wishes