That won't delay your ability to BE seen. When I was there back in August, it was a total cattle call. So many people. Every kid has to be scheduled in by their recruiter and it's both enlisted and officer applicants. There are so many people going enlisted it isn't surprising you are back of the line right now. Continue to communicate with your OR and see how the scheduling process is done. Do they need to do it two weeks out, 3 weeks, can they call and put someone in day of? Ask (respectfully) what the hold up is and how you could be helpful to speed this thing along.
That said, from my personal experience, it's MUCH easier to have the paperwork for your condition saying you're OK when you're at meps than trying to get it mated with your paperwork and approved later on down the line. Maybe you're OR is dragging his feet for this reason.