I'm not the supreme authority on HIV transmission. I'm just a member here who happens to spend a little more time, so you or anyone else can do whatever you feel is right.
But just for your information, the same doctor said the following:
Dr HHH:
"it is sometimes wise to have an extra test at the lastest possible time. We do the same thing here. Even though we almost always say 6-8 weeks is plenty of time, when someone is at particularly high risk, WE ADVISE TESTING AT 3 MONTHS."
"assume a known HIV infected partner has unprotected anal sex. The receptive partner has a 1% chance of catching HIV, or 1 in 100. If a test at 4 weeks is negative, his chance of being infected drops to 1 in 1,000. A lot better than 1 in 100, but obviously not good enough. Same test, done at the same time after exposure, but a very different level of reassurance. This person clearly needs another test or two. Even at 6-8 weeks, when the test picks up nearly all (let's say 99%) of infections, the chance he has HIV is still 1 in 10,000. Better still, but good enough? Maybe not. THEREFORE, DOCTOR HOOK OR I WOULD RECOMMEND A 3 MONTH TEST.
You can find the above quotes from Dr HHH in the link below:
http://www.medhelp.org/posts/HIV---Prevention/Hi--Help-discuss-some-questions-i-have/show/1177982
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Again, I'm not a doctor. In MY opinion, I think I should advise people to test at 12 weeks. The DUO at 4 weeks is not conclusive for HIV-2 either. This type is very rare, but people (( at least A MILLION )) have been infected by it. Yes, it is mainly confined to Africa, but it's very real. So, when you compare it with the theoretical risk of oral sex, bear in mind that there have been NO VERIFIED cases of oral transmission while the other has happened more than a million times.
I have other reasons too , which I won't get into
As I mentioned before, please do what you think is right. I think 12 weeks is better. If you think 4 works for you, then you don't need anyone's permission, and certainly not mine. ((no sarcasm intended))