I think the issue was that some doctor or group of them at an individual level decided to deliberately infect people by reusing injection needle in a primitive part of your country. It seems very unlikely that a reputed diagnostic laboratory would do something similar. Logically, there is a lot at stake for a brand to do such, it would revoke their license and nonetheless hamper their brand image.
Unfortunate incidents do happen from time to time, however, it would be unreasonable to live in fear and anxiety. I strongly feel that you are worried about an irrational fear and you should forget about this event and move on.
they are the biggest pathology lab group in the country btw..
Can you find if your clinic reuses the same needle? If you take another test, make sure they show you that it is a new one. A conbo test is conclusive after 4 weeks so you didn't have to wait 3 months, even if your country tells you it takes 3 months.
By the way, symptoms can't be used to diagnose hiv, so you should relax and stop keeping track of everything that you get including the bronchitis. Millions of negative people get bronchitis.