You were not required to get PEP for this particular extremely low risk situation. PEP is recommended after clinical assessment for individuals exposed to a high risk situation (unprotected sex with a confirmed HIV+ partner for instance), done by a qualified doctor.
Anyway, you have already completed the course of medication. To answer your questions,
1. Extremely negligible.
2. Yes PEP is effective is administered within 72 hours of exposure
3. Since you have already gone through PEP, you need to test at 28 days counted from the day you took after last dose, and repeat the test after 3 months.
Dear Experts. As of my exposure, I was on pep for 29 days after 48 hours. After completion of pep I took a 4th generation HIV combo test after 29 days post pep. It was negative.
1. Can you please confirm the reliability of hiv combo test taken 29 days post pep?
2. Do I need further testing?