IME the flights showing in Manage Booking under your PNR don't mean much. Your new flights will show there while you are still on the phone to Qantas and definitely haven't been ticketed yet.
My preferred way to check is to go to Manage Booking, and click the 'Email itinerary' link on the left hand menu. If the itinerary/eticket which comes through is your correct, current booking, then it is ticketed.
If not, you need to get back on the phone to Qantas and get it (actually) ticketed ASAP.
