Its perfectly normal. You can expect the reminder letter somewhere around 3-4 months from your aor date and then waiting period for 6-10 months thereafter for your MR.
I also got my AOR on 16th August,2017; Nothing after that.
When can I expect something, please suggest next steps
NOC Code- 0213 (Inland Application- company sponsored)
Citizenship-India
Here is my timeline
Pre-Screening package submitted- Feb,2016
Pre-Screening Approved– January 30,2017
Nominee Application package submitted – 28th March,2017
Receipt of Nominee Application – April 28,2017
Confirmation of Nominee – May 3,2017
PR application submitted - 12th June,2017
AOR Received(with Application number) on 15th August,2017