I did 4th gen antigen/antibody lab test using blood from a vein at 25 and 67 days both results came negative. Did i should retest at 90 days 

You do not need additional testing. Of HIV antigen/antibody tests are conclusive anytime more than six weeks following exposure. At 67 days, your results are conclusive. The results will not change. There is no reason for additional testing. 

I hope this information is helpful to you. If there are other questions or any part of this response is unclear, please don’t hesitate to use your up to two follow ups for clarification. EWH.