What is the main cause of menstruating for 9 days then stops but starts again when I urinate which is low blood?

Experiencing prolonged menstruation followed by further bleeding upon urination may indicate a few potential issues, such as hormonal imbalances, uterine abnormalities, or urinary tract infections that can irritate the bladder. It's also possible that the initial bleeding was related to menstruation, while the subsequent bleeding could be linked to different factors, such as stress or physical activity. It's important to consult a healthcare professional for a proper diagnosis and appropriate management.