If you are experiencing prolonged bleeding followed by spotting after a missed period and a negative pregnancy test, it is important to consult with a healthcare professional for further evaluation. While it is possible that hormonal imbalances or stress could be causing these irregularities, there may also be underlying health issues that need to be addressed. Your doctor can perform additional tests to determine the cause of your symptoms and provide appropriate treatment if necessary. It's always better to seek medical advice when you have concerns about your menstrual cycle or reproductive health.