What Are The Uses And Side Effects Of Mifepristone Pills?

hello doctor, i wanted some information abt emergency contraception,me and my girlfriend had unprotected sexual intercourse,it was around the time of her ovulation,she took i-pill within 12 hours but we want to make sure there is absolutely no risk of pregnancy. i herad abt mifepristone pills that can be taken on 27th day of cycle.plz guide me....