Some women also experience cessation of menstruation during some normal physiological periods, such as puberty, breastfeeding, and menopause. Although there is no onset of menstruation, ovulation can occur in a woman’s ovaries, just somewhat irregularly. Ovulation can also occur without menstruation and can lead to pregnancy if contraception is not used. During puberty and menopause, women’s ovaries ovulate irregularly because their endocrine system is often dysregulated and they do not secrete enough sex hormones and are not able to secrete hormones regularly; during breastfeeding, menstruation usually stops. Since the ovaries distribute estrogen and progesterone, which act on the endometrium, although it does not lead to the appearance of menstruation, the ovaries may also experience irregular ovulation. It is due to the secretion of estrogen and progesterone is not enough to reach the thickness of the endometrium to occur menstrual bleeding. Also when a woman suffers from endocrine disorders such as hypothyroidism, hyperthyroidism, and other diseases such as uterine adhesions, menopause can also occur and ovulation can occur, only the ovaries do not ovulate, as they do in a normal menstrual cycle, every month. Therefore, when a woman has sex although she is in amenorrhea, if she has nausea and vomiting and other early pregnancy reactions, she also needs to go to the hospital for gynecological ultrasound and other tests to have pregnancy ruled out.