I often hear patients in the clinic mention that ultrasound should not be done before the third trimester of pregnancy because of the impact on the pregnancy and the fetus. Although most pregnancies end well, there is about a 20% risk of pregnancy loss during pregnancy, and then these patients may pay the price for not having an ultrasound. The following are some of the abnormal pregnancy conditions that require close ultrasound follow-up: 1. abnormal miscarriage Embryonic abortion occurs early in pregnancy without abdominal pain and vaginal bleeding, the patient thinks the embryo is developing well, but as a result, no embryonic heart tube beat is seen in the ultrasound done in the third trimester, in fact, the embryo has long been aborted and the pregnancy should have been terminated long ago, some patients have ultrasound to find that the embryo does not have the original heart beat, but the follow-up is just not to review the ultrasound, only to know In some cases, the embryo was found to have no primordial heartbeat during the ultrasound, but the patient did not review the ultrasound, but only knew to go to the Chinese medicine clinic to prescribe Chinese medicine for treatment. 2, ectopic pregnancy (ectopic pregnancy) Now we know more about medical common sense, and we think about pregnancy test as soon as we don’t come to menstruation, and we pay more attention to pregnancy, but there are still some people who find out the urine pregnancy test, that is, they don’t listen to the doctor’s instruction to do ultrasound, and as a result, abdominal pain, vaginal bleeding continues, and even shock has been sent to the hospital by 120, and there is no gestational sac in the uterus, which is considered to be ectopic pregnancy and abdominal hemorrhage. It can only be sent to the operating room in an emergency. 3, uterine scar pregnancy In China, the rate of cesarean delivery is still relatively high, but the hospitals have been trying to reduce this ratio, and now the second child policy has been liberalized, after the cesarean delivery, there will be a certain chance that the pregnancy will occur again after the uterine incision, which is more dangerous, continue the pregnancy may occur uterine rupture, dangerous placenta praevia, early ultrasound must be identified. 4, irregular menstruation patients projection of the expected date of delivery obstetric clinics often encountered, three-dimensional B ultrasound and the later ultrasound suggest that the fetus is small, but the number of weeks of small is not synchronized, such as the third trimester and not done ultrasound, doctors are relatively difficult to determine whether it is late fertilization or fetal development is small; but pregnant women who have done ultrasound early in pregnancy, doctors can easily determine and project the expected date of delivery. 5.Trophoblastic disease such as complete and partial gravida. 6, twin chorionic villi, mainly to determine whether it is twin or monozygotic twins. It is very important for both doctors and patients to have an ultrasound. Remember to have an ultrasound in early pregnancy under the guidance of your doctor!