Hello dear, Understand your concern. Please note that Postinor pil, is a two tablet containing 1.5 mg of synthetic progestin, Levonorgestrel. It is intended for the following uses: 1. Unplanned intercourse in couples that are steady or married; 2. Failed measures of contraception 3. In sexual abuse, rape or incest; For this emergency contraception to be effective, it is necessary to take one 1.5 mg pill of Levonorgestrel on a single day and within 72 hours of unprotected intercourse. Best results are seen when Unwanted 72 is taken quickly, within 72 hours of an event, as it takes 72 hours after fertilization for a woman’s body to produce a pregnancy. The level of protection provided by Unwanted 72 is as follows: If taken - within 24 hours – up to 95% effective - within 24 to 48 hours – 85% effective - within 48 to 72 hours – 58% effective If a woman should vomit after taking Unwanted 72, it is recommended to repeat the one time dose for effectiveness in pregnancy prevention under the direction of a healthcare provider. So it may be ineffective in 5%. But due to postiner causes bloating and nipple discharge due to hormonal imbalance as a side effcet. You can check pregnancy by Urinary HCg kit or by blood HCG level and by USG. Take tablet meftal saps three times a day for 2-3 days. Maintain hygiene Best regards Dr. Sagar