exactly what kind of sexual encounter?
Dear friend, pep is not effective taken after 72hrs, why did the doctor suggest pep in the first place? What was your risk? Also the cdc guideline for those on pep is to test at 6weeks,3 months and 6 months, however any negative test is encouraging, also if you are on pep you need to have a complete blood cell count and other blood tests at baseline and at 15days ,check with your doctor.
My exposure was having unprotected sex with an unknown woman..
You started PEP to late for it to be effective. 3 months test post your LAST dose of PEP will be conclusive.