This happened to me too. Apparently the chest x-ray and any other tests you have done at the medical no longer get processed there. They are now sent off to a lab for processing so this adds extra time. I scheduled my medical for 2 weeks prior to the interview.
I have heard that if you attend the interview and the medical report isn’t there, then you just go into a processing state pending the results. It may only hold you up a few days.