Please try not to worry; taking prompt action is the right step. The medication you mentioned contains zidovudine and lamivudine. On its own, this two-drug combination is no longer recommended as a complete Post-Exposure Prophylaxis (PEP) regimen. Modern guidelines require a three-drug regimen for maximum effectiveness. I strongly advise you to visit a healthcare provider, sexual health clinic, or emergency room immediately to get the correct prescription. PEP is highly effective but must be started within 72 hours of potential exposure. You are doing the right thing by seeking help quickly.