You got your AOR on 17, SA-18 and biometrics-19. medical usually is around that. any day it could be popping up in your email.
However, are you in Pakistan? I know in Islamabad - IMO does accept Advance medical appointment, even with the medical request letter from CIC. All you need is your UCI number, which im sure you'd have got from your AOR, Biometrics request etc. Why not to go ahead and get done with your medical. When you recieve the request, just respond right away with uploading the medical report.