I'm in this exact situation.
PA is American
Application delivered Jan 30 with PCC, upfront medical.
Feb 28 - AOR1
Mar 02 - SA letter specifically indicating the file was being transferred to Ottawa
Mar 10 - Schedule A submitted through MyCIC
Apr 27 - Emailed Ottawa VO, they indicated that the file was still at CPC-M
Jun 06 - Called the CIC hotline, asked about file - agent said they had everything and there was nothing I needed to/could do
ECAS has been at "Application Received" the entire time. Only a line indicating they sent me the Schedule A request. No line regarding medicals, no line indicating they started the application. MyCIC is similar - no indication the background check has started.
I've considered calling the hotline again, but I don't know if it would do any good.