Hi A Confirmed Pos Girl Performed Oral As In Was

Hi a confirmed pos girl performed oral as in was insertive that was for 40 seconds max went on pep 4th day and before I start was negative I tested at 17 day it was Negative but was still on pep and and I tested after one week of pep I was negative again and I tested at 3 months after the exposure of oral and I was Negative again ? and an expert told me that was not a risk but still I’m testing for my reassurance the test I did are they enough? Coz I’m seeing on internet that pep might give me false negative at 12 weeks some are saying it’s conclusive some info say other wise and given that it was oral sex and I was Insertive which mean was exposed to saliva I didn’t see any blood after