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Hello from JustAnswer.
The pattern of alcohol intake that you describe would typically not cause a positive PEth test. It requires a higher amount of alcohol intake to generate a positive PEth test. The PEth test is good at detecting moderate amounts of alcohol intake, such as 3-4 drinks per day for several days or about 14 drinks over two weeks. Once the threshold has been exceeded, the PEth test can remain positive for longer than the EtG test, up to 2-3 weeks. But from your description, it does not sound like you have exceeded the threshold that would cause a positive PEth test. So, you should have a negative PEth test on 10/26.
If I can provide any clarification, please let me know.