Oral sex was your risk. The good news is that is not a risk for HIV. Adults get HIV from unprotected vaginal or anal sex or sharing IV drug needles. Air and saliva inactivate the virus. You are not at risk from an activity of oral sex so do not need to worry. You never needed to test in the first place and you certainly do not need to test again. You don't have HIV>
Okay, so you took a rapid test at 156 days. That's past 3 months when they are conclusive so this test is accurate and you do not have HIV. Great news. You don't mention your exposure so will tell you that the only risks for HIV are unprotected/penetrating vaginal or anal sex or sharing IV drug needles. If you had a risk at all, then you should now feel confident you don't have HIV with your negative test.