Placenta grade 1 at 20 weeks pregnant is normal. The grading of the placenta can be used to determine the maturity of the placenta and is divided into grade 0, 1, 2 and 3. The lower the level, the less mature the placenta is. 20 weeks pregnant is still mid-pregnancy, early time, placenta level 0, level 1 is generally normal. By the end of pregnancy, the placenta is still at level 1, which is abnormal, and at that time, the placenta is usually at level 2. When a pregnant woman has a placenta level 1 at 20 weeks of pregnancy, she doesn’t need to worry too much, and she can just have regular checkups. If abnormalities of the placenta are found during pregnancy tests, it is recommended that reasonable methods of intervention be taken under the guidance of a doctor to promote normal fetal development.