I have cramps and a coffee grounds come when menstruation?

Every time the day of my menstruation arrives, I have cramps. It comes from coffee grounds only on the first day, a little bit, and then there is no blood. Is this normal or do I have to do exams?
Expert answer:

It may even be your "normal" way to menstruate, but there is treatment, especially for these cramps, look for a gynecologist.