Thank you for your post.
Your negative HIV Duo test at 69 days is final and fully conclusive. Therefore you do not need to have any further tests. I can assure you that if you get a test at 12 weeks, this will be negative.
I don't think there is any chance it would change after that. Even if you had a third generation test I would regard that as reliable at that point. I am certain you will not get a different result - irrespective of the riskiness of the original event.