Not really, interviews are part of the immigration process. Understand the forms your filling, have a conversation with your spouse about the answers you both have for basic questions like where did you meet, habe you met family, names and dates for important things etc.
You don't have to worry if your relationship is genuine. After AOS you will have ROC and possibly naturalization if desired. Get comfortable with immigration forms, norms and procedures. You can't let anxiety ruin a straight forward process, even if it's stress inducing and infuriating as times.