If the menstrual cycle is regular, the pregnancy sac can be seen on ultrasound after 35-45 days of menopause. If the menstrual cycle is not regular, the pregnancy sac can be seen by ultrasound only after 50~60 days of menopause. If the menstrual cycle is regular, the pregnancy sac can be detected by vaginal ultrasound at 35 days after menopause. Due to the different physical condition and time of conception of each person, it is possible that the gestational sac can only be found through abdominal ultrasound at 40~45 days after menopause. For women with irregular menstrual cycles, there is no fixed time for the gestational sac to enter the uterus as ovulation is also not regular. It is possible that the gestational sac may not be detected until 50 to 60 days after menopause. If you are planning to get pregnant, it is recommended to first monitor the time of ovulation regularly, have intercourse for conception according to the time of ovulation, and then have an ultrasound. If menopause occurs it is recommended to follow the doctor’s instructions for ultrasound to check for the presence of a gestational sac so as not to interfere with the timing of regular pregnancy tests.