Welcome to HCM.
9 weeks after the high risk exposure, this 4th generation Combo test for HIV
Antigen and Antibody is more reliable and conclusive. As the result came as nonreactive, you are not having HIV at all. Don't worry about the reading. If the value came as more than 1, then it is taken as reactive or positive as far as this test is concerned. As your value is less than 1, that is 0.4, so you are not having HIV disease.
Forget about the past and relax yourself.
Have a good day.