If the yolk sac and embryo buds are not visible on the 44th day of pregnancy, those with long menstrual cycles may be retested as prescribed by the doctor, and the pregnancy may need to be terminated, if necessary, during a normal menstrual cycle. If the yolk sac and buds are visible on ultrasound on the 44th day of pregnancy in normal menstrual cycle, but if they are not detectable, and the progesterone and HCG (human chorionic gonadotropin) test are low, progesterone and low molecular heparin can be given under the guidance of the doctor to preserve the fetus, and the ultrasound should be rechecked again, and the pregnancy can be continued if the development of the fetus is good on the rechecking, or termination of the pregnancy should be carried out if the development is not good. Long menstrual cycle of pregnant women, due to ovulation time and fertilization of the egg implantation late, in 44 days of pregnancy ultrasound did not see the yolk sac and embryonic buds is also normal, need to comply with the doctor’s advice for 7 ~ 10 days and then re-examined to learn about the development of the embryo, when the development of the embryo is good, you can continue the pregnancy. If the yolk sac and germ are not visible on the 44th day of pregnancy, the pregnancy can be treated promptly under the guidance of the doctor.