How does placenta previa occur?
Placenta previa is a complication in which the placenta is inserted partially or wholly in the lower uterine segment.
If the placenta does over lie the lower segment, as is the case with placenta previa, it may shear off a small section and may bleed.
This commonly occurs around 32 weeks of gestation, but can be as early as late mid trimester.
Placenta previa can be confirmed with an ultrasound . Women with placenta previa often present with painless, bright red vaginal bleeding.