It takes 6 to 9 weeks for the average person to seroconvert , in that period of time some people might experience what is called "HIV seroconversion illness" or "primary HIV infection" wich is characterized by a flu like illness and can vary in symptoms from person to person, some people don't even experience it and can live an healthy life for over 10 years.HIV testing is not 3 monthes,.. in fact,.. you can't test for HIV,. only the antibodies,.. they can take many monthes, even years to show up,.. Open up a text book and stop getting your info from google searches...
A test at 9 weeks will be reflective of your final test at 3 months.
Antibodies for HIV will show up at the moment of seroconversion wich is usually around 9 weeks and that's when your viral load is extremely high and makes you more contagious.