For women who usually have regular menstrual cycles and suddenly have a menstrual cycle that is pushed back and do not come, and have intercourse without contraception, then it is more likely that pregnancy is to be considered as the cause. If a woman has been having intercourse for a long time without using contraception and her menstrual cycle is usually regular and suddenly she does not have her period, it is often necessary to consider the fact that the estrogen and progesterone in the body have been at a high level after pregnancy and have not withdrawn, so the endometrium does not peel off and she does not have her period. Therefore, it is necessary to consider pushing back the menstrual cycle by one week and testing for pregnancy with an early pregnancy test, or going to the hospital for a blood hcg test to confirm the diagnosis. Some women may not be pregnant, but have their menstrual cycle physiologically pushed back due to other factors, such as common environmental changes, or recent work stress, or even emotional depression, and may also be due to excessive weight loss, resulting in sudden weight loss, causing amenorrhea, so if the blood hcg test is not pregnant, then you should check the ultrasound to see the thickness of the endometrium, and then Based on the results of the test, we should consider whether we need to take progesterone to induce menstruation. Therefore, when a woman has a delayed menstrual cycle, she should not take medication blindly, but must first check and diagnose the cause of the receding menstrual cycle and then treat it symptomatically.