I'm actually in the same boat I had my interview and the officer needed to investigate a few things, he kept my passport and said I should hear something in about a couple of weeks so my interview was on April 6th and tomorrow will be 2 weeks, for now ill just keep waiting and hoping that they don't forget about me. I've seen some comments from other users that it will still say refuse until they issue your visa. even after approval. hopefully you'll hear something good pretty soon. it's really hard trying to be patient when you don't know if you got approved or not.