Hello Oulrish,
ECAS only says, we recieved your application on 19th April 2017.
SA does mention below though but my spouse only received medical request today.
A request has or will be sent directly to the principal applicant with instructions outlining the requirements for submission of the Schedule A to CPC-Mississauga. If your principal applicant or their representative has not yet received this request, or an invitation to link their application to My CIC, it will be sent in the next 5 business days. Your PA or their representative should also check their junk mail in the email account provided at the time of application submission.