Hi doctor i had hiv test after 76 days come back negative i had an 4th generation test.i am still worried have to check again?

Do not worry: For your peace of mind you should get a HIV nucleic acid test at 6 months after exposure. From the information you provided, it is highly unlikely that you have HIV infection. Have a healthy diet, exercise 30 minutes/day, drink plenty of water, have safe sex, no tobacco alcohol weed or street drugs. For nutrition: http://www.choosemyplate.gov/. Get HPV vaccine. Wish you good health!