Pregnancy can also occur 6 days after menstruation, or it can be a menstrual disorder, so the woman is not pregnant: 1, women with regular menstrual cycle, menstruation at a fixed time every month, have a normal sex life, as well as in the reproductive age, no contraceptive measures, 6 days after the delayed menstruation, blood test human chorionic gonadotropin level is elevated or do a urine pregnancy test appears positive, it will be highly suspected of early pregnancy. The gynecological ultrasound can be done around 10 days after the delayed menstruation, and the normal intrauterine pregnancy can be determined only when there is a full-grown gestational sac and fetal buds in the uterine cavity. 2. When women usually have irregular menstrual cycles or when they reach menopause, have polycystic ovary syndrome, hyperthyroidism and other diseases, their menstruation will be delayed, and when their menstruation is delayed for 6 days, it is possible that they are not pregnant, therefore, by taking blood test for human chorionic gonadotropin level If the chorionic gonadotropin level is within the normal range and there is no growth of a gestational sac in the cavity by gynecological ultrasound, it is not pregnancy.