You didn't have low risk - you had NO RISK. Any test you take will be reliable, conclusive, and negative, because you had NO RISK for HIV.
Exactly pcr test may take a day or two that's why it's very scary it's understandable
I think you take pcr test as early at 7 days you took at 9th day I think it's very good very assuring I think you have made it out
But now just take ag /ab combo test 4th generation test at 21 days for early assurance and then just repeat at 28 days post exposure
I agree with your doctor you should be fine I think you really will be fine