As an STD assistant, I understand your concerns about potential HIV exposure. While being on PrEP and having an undetectable partner significantly reduces the risk, it's natural to feel worried. However, it's important to consult a healthcare professional for accurate guidance based on your specific situation. They can provide counseling, testing recommendations, and help address any fears or uncertainties you may have. Remember, seeking support and taking proactive steps for your sexual health is commendable. With proper precautions and open communication with partners, you can navigate this in an informed and empowered manner. Please don't hesitate to reach out to medical experts for personalized advice and reassurance.