Our members have answered your questions.
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It is not clear if you have protected or unprotected anal sex .. you are not sure about presence of condom or no .
You started pep already and nothing to be done more now.
Does pep effective or no : this is very complicated question cause most of pep studies done on rats and to know exact pep effectiveness we need to know who was positive and pep succeeded to stop replication of virus before it occurs which look to be very difficult .people take pep then do the test then showed negative , this does not mean the pep succeeded cause simply we do not know if they been already infected or they just took pep as a placebo.
I don't really think there is anything else anyone can do for you here. You were told that your risk of a condom break has LESS THAN ONE PERCENT chance of HIV transmission. And that PEP is considered effective while may not be 100 percent. But as effective as it is, your one percent risk is negligible. None the less, finish pep I'd personally not have taken it for such a low risk rate but since you did . . .) and then test at 28 days past that. All the rumination and posting won't help. In fact, it makes your anxiety worse. Get off the internet and test at the appropriate time. I bet my right arm it will be negative. Then your worried well self may begin to question the test result. They call ocd the doubter's disease. But your first test taken if a 4th generation duo test at 28 days past the last day you took pep will give you a conclusive result.
My chances of catching HIV are extremely low as you stated, despite being on PEP. Is the part that scares me the most. Also, the CDC stated that PEP isn't gauranteed to work. 80 percent still leaves that 20 percent. Does the 20 percent account for PEP failure? I sure hope I won't be in that percentile.
I don't know where you read that PEP is unlikely to work, but PEP is HIGHLY effective at preventing HIV transmission. No medication works 100% of the time, but PEP works more than 80% of the time.
A one-time event, even without PEP, is very low risk. Plus, you don't know for sure that your partner is HIV+. Continue taking the full course of PEP, but your odds of contracting HIV are extremely low.