Pregnancy can cause menopause. During a normal menstrual cycle, the follicle in the ovary discharges an egg into the corpus luteum, which secretes estrogen and progesterone. If the egg is not fertilized, the corpus luteum gradually atrophies, so that the levels of estrogen and progesterone in the body decline, the endometrium vasoconstricts, and necrosis of the endometrium and shedding of the endometrium triggers bleeding and the formation of menstruation. However, after a woman becomes pregnant, the pregnancy tissue synthesizes chorionic gonadotropin, which supports the continued development of the corpus luteum, so that estrogen and progesterone levels in the body are always maintained at a high level, and the endometrium is unable to produce shedding, so menstruation does not occur. If vaginal bleeding occurs during pregnancy, it may be caused by excessive stress and overwork. If the bleeding is small, there is no need to worry too much, and the symptoms can be improved by adequate bed rest after timely medical checkups with no abnormalities. If the amount of bleeding is large, you also need to consider the situation of preeclampsia, ectopic pregnancy, etc., you need to consult a doctor for examination in a timely manner, after diagnosis and symptomatic treatment, if necessary, to take birth control, surgical treatment, etc.. After finding out that you are pregnant, you should go to the hospital to complete the relevant examinations to make sure that the function of all organs and the position of the embryo are in good condition. Avoid overwork, pay attention to self-protection, avoid infections, and seek medical attention in time to avoid delaying the condition.