My US F-1 Visa was approved by the consular on the day of my interview. The next day I received-?

a call from the US Embassy saying that I had to appear in front of the consular again as the consular needed some additional information. The additional information was regarding my "withdrawal from the American University" ( I was enrolled in a state college and after spending 3 semesters my GPA was less than the required GPA to continue in my major which was engineering. So I decided that the best thing for me would be to start over again as a freshman in an another college. ) The next day I appeared in front of the consular and he asked me that "why did I leave that State college and I explained him the reason. After that he showed me thumbs up and said they if they required any more information they would contact me. later that day I got another call from the embassy saying that I would need to write them an email attaching a letter explaining the reason for withdrawing from the State University and attach documents proving the number of credits I had completed during the the three semesters at the State College.( I really do not understand why they needed that proof of the number of the credits I had completed at my previous University since I am not taking a transfer but instead starting fresh.) Anyways I did write that email and attached all the documents they had requested for. It normally takes the consular office to reply within 3 Business days but its been more than 3 Business days and I have not heard from the embassy yet. They have my passport and the I-20. What does this mean? Has my visa been approved or they need some more information? What should I do?