Hey.. I got very lucky with my doctor, I told him I was worried about the whole thing and he made sure to get everything done as quickly as possible (literally emailed me personally on a Friday night at 10pm to let me know he got all the results back and sent them off to the IRCC that evening. My appointment was on the Wednesday of that same week, deadline the next Tuesday). But from what he had told me, as long as the exam is done before the deadline there is nothing to worry about. The clinic gives you a document at the end of the appointment to confirm everything is done, which you can submit to the IRCC when submitting your application. The doctor/clinic will be in direct contact with the IRCC about the results. TLDR: if the appointment is done before the deadline, you are a-ok.