A duo test is conclusive at 28 days. Some sites are more conservative as you have noted, but the expert doctors we receive advice from say there is no need to test later.
It seems that you don't understand that you don't get HIV every time you have anal with someone who has HIV. You got lucky,but another person might not be so lucky. All that matters is you tested conclusively that you don't have HIV.
Thanks for answer. We had never sex again when my partner got diagnosed.