Pregnant women in early pregnancy generally need to do two B-ultrasounds. The first one is about 6-8 weeks of pregnancy. Currently, the following are: 1. Check the fetal heart rate. After there is an embryo, there must be a fetal heart rate to prove that it is a live fetus. 2. Determine the size of the fetal embryo and whether it matches the last menstrual period, and calculate the expected date of delivery of the baby. If the menstrual cycle is relatively long, the expected date of delivery can be corrected based on the length of the embryo prompted by B-ultrasound. 3. Determine intrauterine pregnancy or ectopic pregnancy; 4. Determine single pregnancy or twin pregnancy (multiple pregnancy). The second time is probably between 11 and 14 weeks. During this period, fetal chromosomal abnormalities and other fetal chromosomal abnormalities can be detected early by checking the fetal nuchal membrane thickness (NT), combined with Down syndrome screening. When some expectant mothers read the B-ultrasound report, they found a sentence: \”The lower edge of the placenta is 30mm from the internal os of the cervix.\” After searching on Baidu, there were severe bleeding, shock, intrauterine fetal death, and uterine resection… Under normal circumstances, the placenta is attached to the uterus. The posterior, anterior or lateral wall of the body. Placenta previa means the placenta is implanted in the lower segment of the uterus or covers the internal os of the cervix. According to the attachment site, it is divided into: complete placenta previa, partial placenta previa, marginal placenta previa, low-lying placenta, subplacenta previa If the edge is more than 2 cm from the internal cervical os, it is not a low-lying placenta. When the gestational age is small at the beginning, the placenta will be relatively low. As the gestational age increases, the uterus increases, the lower uterine segment of the cervix will lengthen, and the placenta will move upward relative to it. Pregnant women often ask about ways to solve the problem of low placenta. Unfortunately, I can only tell you that current medical technology cannot move the placenta. The placenta cannot move. If the placenta moves, there are many blood vessels under the placenta and may cause massive bleeding. In fact, no matter how low or high the placenta is, as long as there is no bleeding, it is the best. Of course, if the position is higher, the possibility of bleeding is smaller. What is the Life Guide for Pregnant Women and Expectant Mothers PDF If the problem of low-lying placenta occurs, please pay attention to the following issues: 1. Pay attention to rest, avoid overexertion, and avoid all strenuous activities, such as running, jumping, etc., and some movements are absolutely inappropriate Do, such as squatting, kneeling, sitting down or standing up slowly, and do not lift your hands. 2. Avoid constipation, sexual intercourse, and increased abdominal pressure. 3. Go to the hospital promptly if you have abdominal pain or bleeding. Bleeding from a low-lying placenta is often painless vaginal bleeding. 4. Have regular prenatal check-ups and follow the doctor’s instructions for a B-ultrasound check. If placenta previa is confirmed at 28 weeks of pregnancy, it is recommended that you choose a local tertiary hospital for prenatal check-up and delivery.