Hello dear, Do not worry No need to take another unwanted 72. No cross reaction between unwanted 72 and fever medicine. Unwanted 72 contain 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. Still you have doubt For safer side: you should go for Blood HCG level (After 7-10 days of normal mid cycle) or Urine pregnancy kit (7-10 days after missed period) If it is positive: you should take pregout abortion kit orally or vaginally to remove pregnancy. Hope this will help you. Wish you good health Best regards Dr. Sagar