when you are marrying an american citizen lots of things will go amnesty. working illegally will not even be talked about in the interview. All they will be looking after will be if the marriage is fake or real and last thing if you were ever been convicted of any felony. Even you had felony, they will still work with you because you got married to an american citizen. Overstay, illegal, your work status are non of the things they will go into. So good luck to you and try to make the marriage as real as it can be.