How Effective Is Unwanted 72 In Preventing Preganancy?

Hi I had sex two tymz a day and took unwanted 72 dat night and again next day had sex two tymz and took same tablet on dat evening , previously I took unwanted 72 one tym so totally three tymz I took and I took two tymz for two days ...is there any thing happens please answer me ..i am 23 year old