Provera

A woman’s menstrual cycle is a complex process that is controlled by at least four different hormones. The blood levels of these hormones change throughout the menstrual cycle, causing an egg to be released from the ovaries (ovulation), preparation of the womb lining for a possible pregnancy and shedding of the womb lining each month if pregnancy doesn’t occur (a menstrual period). There are plenty of places that this complex process can go wrong.