Request for Evidence (RFE) can be sent for variety of reasons, but usually, before the interview, it is because some initial information is missing. You did not indicate whether it was a stand-alone petition or one filed in conjunction with adjustment of status. I suggest you wait until the letter comes in the mail (make sure your address is correct on USCIS record), and read the RFE carefully. You will likely have almost three months to respond. Consult an experienced attorney if there is anything you have difficulty answering.
Did you also apply for permanent residence (I-485) at the same time?
What does the Request for Evidence ask for, specifically? You will need to pay very close attention to the letter from USCIS, and respond within the time limits listed.
I suggest that you consult with an experienced immigration attorney about this case.
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The request for evidence is sent out when an individual does not supply all the information required by USCIS. Contact USCIS to figure out when the letter was sent out. The letter will tell you what additional evidence is required. If you have a hard time understanding the process, contact an immigration attorney to guide you through the process.
This is general information and not legal advise. This communication does not create a lawyer-client relationship.