If your FO is Chicago, saying all the people around you are getting their IL while nothing is happening with your case isn't quite accurate in that case, considering there are other Chicago folks who filed around when you did (or shortly after) who are also waiting for their IL. This is why context matter. Each FO operates independently of each other, you can't judge your progress (or lack of it) by what is happening with other cases in other FOs.
Considering your medical report, I guess you'll just have to wait and take it with you to your interview if they did not provide information on how to send it in. I hope you're aware the CS's signature cannot be over 60 days when you do present it at your interview.