HIV cannot be spread through saliva as it contains bacteria and enzymes that render the virus inactive. There has never been a proven case of anyone contracting HIV from oral sex alone. The doctor is correct in not saying 100% because it's POSSIBLE, but extremely UNLIKELY that someone, somewhere on the planet HAS contracted HIV from oral. But consider that when it was shown oral sex was EXTREMELY low risk for HIV, millions upon millions of people began to practice ONLY oral sex. The rate of HIV actually declined during that period. Also consider that if everyone who engaged in oral sex was put on PEP, we'd ALL be popping it like Pez.
It is possible to get other sexually transmitted diseases (STDs), such as syphilis, herpes, gonorrhea, and human papilloma virus (HPV) through oral sex. Did your doctor recommend you have a complete STD panel done?
It IS the stance of this website that oral sex is NOT a risk for HIV, you do not need to test for it and PEP is totally unwarranted.
But you CAN and you WILL find sites, as well as highly respected HIV experts, that disagree. So, what the bottom line comes down to is that after researching all the facts, figures, ratios and percentages of risk, the decision to go on PEP is YOUR decision.
You also stated that you will get an HIV test IMMEDIATELY after you finish your PEP treatment. Whichever doctor put you on PEP should have explained to you the post-PEP HIV testing recommendations are to test at six weeks, three months and six months from the date of exposure for 100% conclusive results.
I'm sorry you are going through something you never had to. PEP is NOT a pleasant experience. What you can grasp onto is knowing that a few months down the road, you will have peace of mind.
I wish you the very best
RubyWitch