After vaginal sex with a person of unknown status. I took hiv ,hep b and hep c test at 11 weeks all of them Negative. Can i forget about   These three diseases?

First, if you used a condon, there was no risk for these viruses. If you didn't, I hope you'll get into the condom habit! But even without a condom, the chance of infection is extremely low for any single exposure.

These tests are 100% conclusive at 11 weeks. You can forget about them. FYI, hepatitis C actually isn't transmitted at all by sex with women and should not be considered an STD. And hep B is rarely transmitted heterosexuallly. But in any case, your results are conclusive and no further testing is necessary.

I hope this information is helpful. Let me know if anything isn't clear.

HHH, MD