Women who have regular menstrual cycle and have not come 6 days after the postponement of menstruation have the following reasons: 1. They may be affected by mental, psychological and work pressure and have delayed menstruation, women can wait for a few more days or give menstrual stimulant medication. During this period, it is important to keep the mood relaxed to facilitate the normal arrival of menstruation. 2. When a woman is pregnant, she may not have her period, which may be accompanied by morning sickness, vomiting, fatigue and weakness. Women can also check their own urine pregnancy test, if there are two red bars, the possibility of pregnancy is high, blood test chorionic gonadotropin level, can also be tested again after 7 days gynecological ultrasound. If a gestational sac is present in the uterine cavity and a fetal bud appears, the diagnosis of intrauterine pregnancy can be confirmed and the results are more accurate.