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No, it always works out one way or the other.
Don't panic, just keep your nose to the grindstone and keep heeding the sage advice of your LO; keep paying bills on time and keep utilization ratios low if possible.
Pre-approval just means that you meet the criteria of a QM and they have asked for the documentation and if they match what you supplied you shouldn't worry too much about it falling apart at the last minute. You should have a processor that's handling your paperwork-reach out to them and ask where everything stands, they should be very honest with you. Don't panic, breathe.........