that's probably because the mail man could not find your address or something. make sure you double check to see if you have the correct address on there. also the approval notice online often says if you don't get your card by a certain time you can contact them. follow the directions you see on there on when and how to contact them. you'll be fine.

thanks @kim. I already contacted them but they send i should put my concern in writing and send to their office. I'm just confused 😕