You are so close to having your immigration completed; the best thing to do is to follow the rules and have a new, current, medical exam once your interview date has been determined. Chalk up the cost of the earlier medical exam as a learning experience Why play around on the firnge of the rules?
Just so you don't set unrealistic expectations, we have had a CC since November 14 and still do not have an interview date. You can visit the December Interviews worksheet and see this is true for all people who have shared their times in all but one instance. We are reasonably expecting to have an interview in the Middle of January, 2015, based on current processing times and also recent experience for the Jakarta embassy. It would be very unusual for you to CC and have an interview date within the next two weeks. I would expect that if you do not get a Checklist and do CC around or shortly after December 8, 2014 that a reasonable expectation might be for an interview in the middle of February, 2015 and hope for something earlier, but don't make plans or set your heart to get crushed if it doesn't happen.
MktMaven got a reaction from silverjetplane in Medical Exam done BEFORE interview date. Will this be a problem at the interview?