There is no definite fixed time for the first ultrasound examination after pregnancy, and it can be done when needed. As a common auxiliary examination, ultrasound can help pregnant women to determine intrauterine pregnancy and exclude ectopic pregnancy, trophoblastic diseases, pelvic masses, etc.; it can also help pregnant women to determine the gestational week and the development of the fetus. Therefore, after the discovery of pregnancy, ultrasound can be performed when necessary in order to clearly understand whether the position of the gestational sac is clear, to verify the gestational week, to determine the number and development of the embryo, and to observe the early development of the placenta. For the safety of the pregnant woman during pregnancy and to ascertain the growth and development of the fetus, you can go to the hospital and have the examination done under the guidance of a physician if necessary.