Placenta previa, also called placenta praevia, is a recurrent bleeding at 27 weeks and may be caused by misplaced separation of the placenta from its attachment.
After 28 weeks of pregnancy the placenta is attached to the lower segment of the uterus, the lower edge of the placenta reaches or covers the endocervical os, and its position is lower than the fetal preluxation, which is clinically called placenta previa, and before the 28th week of gestation, the placenta is considered to be low status.
When the isthmus of the uterus elongates to form the lower uterine segment, pulling the endocervical os, and the cervical canal gradually shortens and dilates, the placenta praevia that was originally attached to the lower uterine segment and the endocervical os becomes less able to stretch, and the misaligned separation from the place of attachment causes vaginal bleeding, which may be repetitive.
Repeated vaginal bleeding due to placenta praevia at 27 weeks of pregnancy should be alert to the possibility of preterm delivery of the fetus, usually pay more attention to rest, reduce external stimuli, and go to the hospital for treatment if necessary.
Repeated bleeding of pregnant women with placenta praevia pay attention to perineal hygiene to reduce the chance of infection.