I have horrible cramps but no period for 6 months, i'm not pregnant. whats wrong? every month i get bad cramps but no blood.

See a doctor: This could be a serious problem. One cause for concern is known as an imperforate hymen in which case you are having a period, but there is no route through which the blood may exit the vagina. See your primary care doctor to have this evaluated.

No ovulation: It is common for some women to have irregular periods. This is usually due to irregular ovulation. Schedule a visit with an obgyn for testing. They will likely test you for something called pcos as well as thyroid disease and a prolactin level. Birth control will usually regulate the menstrual cycle.