There will be 2, 6 digit PNR IDs: One that is the system where Expedia executed and maintains the booking, and a second one in the Turkish Air reservation system. If you are using the Expedia PNR record locator, it will not come up in the Turkish Air system. That said, I would be trying to find my e-ticket confirmation, as that is your assurance that everything processed properly with your booking. Expedia customer service should be able to give you the TK record locator if you don't see it somewhere in your documentation.