Why do you not feel your test is conclusive at 5 weeks? Sounds like it was a combo test which IS conclusive at 4 weeks. If you don't know what test it was, how about a simple phone call to find out. Your risk was so low. You are freaking out in a way that isn't warranted considering your test is probably conclusively negative and you had a low risk. You seem to be working yourself up when it isn't necessary.
Mike_no asks the important question of whether you used a condom or not. But either way, a single exposure, as he says, is very low risk. No reason to panic. I agree with the rest of what Mike_no says as well.
Depends on what type hiv test u took. Some r conclusive at earlier time