Thank you for your query at DoctorSpring.com
I understand your concern.
HIV survives outside the body not more than 30 seconds. So, since it's already been 6 weeks from the exposure, you can go ahead and get the 4th generation test done ( antigen-antibody ) combo, however, the chances of HIV transmission from the exposure is miniscule, and there is nothing to worry. I am suggesting the test for your own satisfaction.
Feel free to discuss further,