every country is a little different, when you will get your interview date depends on how busy the embassy is. for every photocopied documents you submitted to nvc, you have to bring the original copies to the interview with you. and for financial documents like proof of asset, you have to bring updated versions. every embassy requests different things, i would suggest you to check the website of the US embassy in your country to make sure you dont miss any documents. call them and ask if you can get your medical examination done now or do you have to wait until you get interview letter email to do so. good luck!
