Insurance Approval: Tufts Medical Center -- BCBS

I'm really nervous because I'm supposed to have surgery in 1 week and when I called the insurance company (BCBS) today they said that they have no record of a pre-approval request from my surgeons office. I have called the coordinator that works for my surgeon at Tufts Medical Center and she said to just assume its covered unless they tell me differently but that makes me really nervous because the insurance company still doesn't have any record of this and they said that any requests for pre-approval require 2 weeks to process. I know I'm probably getting worried for nothing but I really wish I knew one way or another so I could make the next move. Anyone else still not have approval at 1 week before your surgery date?

Thanks,
Chris