My gynae started discussing abt it at 36th wk but we only confirmed it at 38th wk as I was contemplating abt getting an elective csect, which I eventually did at 39th wk due to baby's big size. Frm 36th wk onwards it's a weekly appt.
My gynae gave me the option to wait or induced at me at wk 39. From wk 35 onwards the scans are weekly to ensure amniotic fluid is sufficient