Women of childbearing age who have a normal sex life and do not use contraception and experience a delay in menstruation for about 7 days can check for early pregnancy. When a woman has sex during ovulation, if the egg and sperm are able to combine and develop into a fertilized egg, the fertilized egg will move to the uterine cavity 7-8 days after sex to grow and develop, stimulating the luteal gland of the ovary to secrete chorionic gonadotropin at a higher level. When a woman has her period delayed for 7 days or so, by checking the early pregnancy test paper, there are two red bars or the chorionic gonadotropin level increases significantly in the blood test, it is highly suspected to be early pregnancy. However, in order to diagnose whether it is a normal intrauterine pregnancy, you need to do gynecological ultrasound, the uterine cavity appears to have a full growth of the gestational sac and the emergence of fetal buds, it can be diagnosed as intrauterine pregnancy. In addition, women with irregular menstrual cycles, often early or delayed menstruation, the time to detect pregnancy will be different, there is a delay in menstruation, you need to go to the hospital in time to draw blood or gynecological ultrasound, to confirm the diagnosis of pregnancy.