I think TPM Reader DC has this right. The real question isn’t when Trump tested positive. It’s the last time he had a negative test result. That seems likely to be the issue with the muddled timeline …
The most important question for timeline is when the last negative test was, and exactly when and what testing platform were positive results obtained.
I am supposing he tested negative Wednesday AM using the daily Abbott rapid test. 50% false negative rate.
In retrospect reports that he was dragging Wednesday Night might explain why Conley indicated he had been sick for 72 hours.