Is 3rd generation rapid test conclusive at 83/84th day from a low risk sexual encounter (oral; giving and recieved)?

See below: Agree with Dr. Zimon To be sure, get a HIV nucleic acid test at 6 months after exposure. Wish you good health! - Have a diet rich in fresh vegetables, fruits, whole grains, milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Drink enough water daily, so that your urine is mostly colorless. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form. Practice safe sex, if you have sex.

Yes: There is no reason for any further study. You're an adult now and it's good to get a HIV check yearly. You can get gonorrhea and other stuff from either giving or receiving this way, but the HIV risk is too low to estimate. I hope you'll cherish what happened, even though human love is never perfect, and love wisely and well from now on.