The placenta covers the endocervical opening at the 17-week check, and if the placenta is still present after 28 weeks, it will still cover the entire cervical opening in late pregnancy. The normal attachment of the placenta is to the posterior, anterior, or lateral wall of the uterine body. The state of placenta previa at 17 weeks of pregnancy usually does not require any special treatment, and you need to follow the doctor’s instructions for regular obstetric examination to observe the growth of the placenta. If the placenta is still covering the endocervical opening after 28 weeks of pregnancy, it is classified as placenta previa. As the condition progresses, it may develop into complete placenta previa, which means that the placental tissue is lower than the prenatal area and completely covers the cervical opening. Complete placenta praevia may result in antepartum hemorrhage, intrauterine hypoxia, and preterm labor. It is recommended that patients with placenta praevia should go to the hospital in time and follow the doctor’s instructions for treatment to avoid delaying their condition.