I guess the answer depends on which science you follow. Some reports say there is a very high false positive rate and a very low false negative rate. Is there any way to really prove the veracity of a PCR test? As I recall Elon Musk claims he took 4 tests back to back early on when they became available and reported he had 2 positives and 2 negatives.
According to my science, Musk took the tests all for naught.