Thanks for your query
tridot test is a very sensitive (~100%) and specific test (~95%) for HIV, that is it can detect accurately who are having HIV antigens and also a positive test definitely means that person is having infection of HIV. It is a rapid screening test.
Screening test means test used to rapidly screen the population so some times false positive results may be observed some times.
You had unprotected intercourse
about 4 years back, I want to know whether you are having any clinical features?
you have checked twice, first time it was with one dot on control and one on HIV2, it means that test was positive for HIV2, but it may be false positive.
In reconfirmation there was only on dot on control and no dots on HIV 1, HIV2 so its negative. As I have already told you that its a screening test it can detect HIV with reliability but positive test does not always means AIDS
I think you are well and if you still want to check further then go for P24 antigen assay and WESTERN BLOT tests which are more specific and easily declare you negative.
All the best and take care