Dear Everich,
Your best protection is vaccination because that is extremely effective in blocking transmission via sex. The published efficacy rates for the vaccine are around 95% for generating sufficient antibodies. Transmission when your HBV antibodies (called anti-HBsAg) from the vaccine are >10 IU/ml is extremely rare. Your medical provider can do a simple blood test to measure your anti-HBsAg antibody levels. Using a condom will further reduce the risk. I hope this helps.
John.