Placenta accreta causes no symptoms during pregnancy, although vaginal bleeding may occur during the third trimester. Placenta accreta is detected during a routine ultrasound. ✨ Reasons: Placenta accreta is thought to be associated with abnormalities of the uterine lining, usually due to scarring after a C-section or other uterine surgery. Sometimes it occurs without previous uterine surgery. ✨ Risk factors: 1 -Previous uterine surgery. 2-Place the placenta if the placenta covers the cervix. 3 -age of the mother.