If your menstrual cycle is regular and you have your period once every 30 days, it is advisable to go for an ultrasound examination after 45 days of menopause. At this time, the gestational sac in the uterus can be detected by ultrasound, and the germ tissue may be seen by ultrasound, because after the fertilized egg enters the uterine cavity on the day of coitus, it takes about one month to see the germ tissue by ultrasound, so it is recommended to go for ultrasound examination after 45 days. If there is no clinical discomfort, you can go back for ultrasound in the second month of pregnancy. This is because at two months, the size of the gestational sac can be seen and the germ tissue can be seen, and the fluctuation of the primordial heart tube can be seen, and at this time, the diameter of the head and buttocks is usually around 2cm.