Done worry u will soon get it.. My letter said 4 weeks too...I applied May 29, and I just received my card in the mail yesterday June 26. So exactly the 4th week I got mines(the last day in the 4th week).. Some people get there's b4 the 2nd, 3rd or 4th week. So just keep lookin out for it once your 4 weeks are up and u still didnt get it go back to the office
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Received:10/1/12 Bios:10/25/12-NO WALKING
3/6/13(transferred). Rfe 4/18/13 received 4/22/13
Send back rfe 5/10/13 received 5/14/13
Approved 5/16/13 approval letter receive 5/20/13 EAD receive 5/22/13
SS#5/29/13 received 6/27/13 permit 1/8/14