If you're going to do PEP, a very quick Google search will inform you that you MUST do it quickly - if 72 hours pass since your encounter/exposure, it's not effective.
An excerpt from the Planned Parenthood website says: "But you have to start PEP within 72 hours, or 3 days, after you were exposed to HIV, or it won’t work. The sooner you start, the better it works — every hour matters." https://www.plannedparenthood.org/learn/stds-hiv-safer-sex/hiv-aids/pep
So, TIME IS OF THE ESSENCE!!!
Good luck.