Exposure on 30th of june i fingered a girl of unknown hiv status for 7sec and there was a small cut under my nail it was not bleeding,after that she gave me a naked rub,my penis was touching her anus i started pep after 14dys,my hiv pcr -ve on 27july?

PEP was not warranted in such a case. Nobody has ever been known to catch HIV by fingering, regardless of cuts on the fingers. "Penis touching anus" also was risk free. And statistically it is unlikely your partner has HIV. With PEP, the window period for HIV testing starts when PEP is finished. You need to be tested (preferably with an AgAb (4th generation) blood test 6 weeks after final dose.