well thats the same situation i am in but u cant go back to interview unless ur priority date is current. let me know when is ur p date and which status u r in right now. otherwise its always safer to apply for adjustment of status. whether ur wife woked or not they not gonna find it so u should go for aos. but there might be problem as well for consular processing if they find that ur wife did work illegally. so be careful. good luck bro