I just tested hiv negative. What are the chances I have HIV?

You do not have HIV. Most people would test positive within 3 months after getting infected. In very rare cases, it may take up to 6 months for someone to test positive. Testing 6 months after possible exposure can be considered accurate. You tested negative long after that 6 month time frame had passed. That means that you are fine. You did not get infected by your possible exposure 5 years ago.