My daughter got a PCR test as soon as she tested positive. It was 7 days before our cruise and we had to cancel. HAL was great and rebooked us on the same cruise 4 weeks later. She did lose her airfare. With the PCR test she was able to obtain a proof of recovery document. It is our understanding that presenting the positive test and the proof of recovery document is what you have to do but I'm not sure if you have enough time.