Menstruation time has not arrived, there are blood stains, what kind of examination should be done

Patient's question:

Menstruation time has not arrived, blood stains appear, what tests should be done

Doctor's answer:

Hello, if there is bleeding when your period hasn't arrived, it could be due to issues with your body's constitution or gynecological diseases. Also, pay attention to whether it's ovulation bleeding. Maintain hygiene and wait a few days to see.