As soon as pregnancy is detected, we need to go to the hospital for a checkup. In the early stage of pregnancy, we need to do blood tests to check the chorionic gonadotropin and progesterone values in the blood, because in the early stage of pregnancy, the size of the fetus cannot be seen by ultrasound yet, and we can only judge whether the embryo is developing normally by the HCG value. If the development is normal, the HCG value will generally increase exponentially after 48 hours. If this condition is not reached, it is usually suspected that the pregnancy is ectopic or the embryo is not developing properly. At about 45 days of pregnancy, you can go to the hospital for the first ultrasound to confirm whether the pregnancy is intrauterine or not. In addition, the ultrasound can also reveal whether the fetus is developing normally.