1) Nobody is known to have ever acquired HIV
, even when cuts etc were present. It probably can occur, but is very rare.
2) I doubt you can draw any inferences from the time it takes for test results to return. It is dependent less on the result (positive or negative) than on simple operational aspects: when the specimen was drawn, when it arrives in the lab, when the lab does its next test run, and when the lab sends out the results.