1. Is it possible that I could have given my boyfriend hiv? Since I had sex with him before I finished pep.

2. Could hiv  in my system transferred to him, then cleared out of me after I finished PEP? 

3. I read many forums online that says “don’t have sex while you’re taking pep because you can pass it on to others”. Does that mean that I have infected cells while I’m taking pep, but then pep clear those infected cells up

4. Should I have told my boyfriend about the encounter so that he Could have gotten on pep himself? 

You should be having no worries at all. Your negative HIV tests following PEP are 100% proof you do not have HIV and never did, even transiently. PEP does not merely temporarily suppress HIV then allow its regrowth. The drugs are effective in preventing infection within a few hours of the first dose. To my knowledge there has never been a reported case of HIV transmitted during PEP, if the PEP proved effective, as it was in your case. These comments pretty well address your specific questions, but to assure no misunderstanding:

1. Is it possible that I could have given my boyfriend hiv? No, it is not.

2. Could hiv  in my system transferred to him, then cleared out of me after I finished PEP? No. That is not known to happen.

3. I read many forums online that says “don’t have sex while you’re taking pep because you can pass it on to others”. That's a cautionary statement in case PEP doesn't work, e.g. if the HIV strain to which you were exposed were resistant to your PEP drugs. 

4. Should I have told my boyfriend about the encounter so that he Could have gotten on pep himself? No, there was no need. 

I hope these comments are helpful. All is well! Let me know if anything isn't clear.

HHH, MD

I know you said to my second question that it is not known to happen. However, is it scientifically possible for this to happen (giving someone hiv while on pep, then testing negative outside of the window period myself)? I know doctors can’t say anything with absolutely certainty. However, I just want to be reassured as this has been causing me a great deal of stress 

 

1. My boyfriend has had a white tongue this last year ( I’m assuming thrush) it did get better one time when is sucked on ice. But it came back a short time later. Is this characteristic of thrush for HIV? 

2. From a pure medical necessity perspective, should I tell my boyfriend about the potential exposure so that he can get tested? 

3. Can you give me a simple explanation of how PEP works and why it would be scientifically impossible to give hiv to someone while I’m taking Pep, but never get it myself?

I'm glad to see you recognize your apparent OCD. It certainly seemed likely from your questions and your frankly irrational concerns about all this. If you continue to find yourself ruminating about it, consider professional counseling.

2. Repeat question. I advised against this above. But it's your relationship, not mine:  feel free to tell him whatever you wish. But there's no need from a medical/risk perspective.

3. Much too complex and potentially time consuming for this forum. Try an AI search (like ChatGPT) with a question something like "How does PEP work to prevent HIV infection?"