premature menopause

If you have amenorrhea and you don't have a period and are not pregnant, then certain tests can be done to find out why you are not getting your period.

There are three phases in your menstrual cycle – follicular phase,
ovulatory phase and luteal phase. In terms of LH surge, the ovulatory
phase is most important.

Premature Ovarian Failure (POF) is a loss of ovarian function in younger women. POF is associated with amenorrhea (no menstrual period), estrogen is low, and the follicle-stimulating hormone (FSH) level is elevated.