I'm writing this for my friend. She had unprotected sex with her boyfriend 3 times in last one month (27 days to be exact). She didn't get periods after that. She tried the pregnancy kit test and the results showed negative. But she is still worried of getting pregnant. What should be done regarding this. Is mifepristone tablet be used now to avoid pregnancy. If this tablet is not adequate please suggest a tablet other than this. She is 21 years old.