The first thing to look at when giving birth with a hidden history of an abortion is how many days of menopause were involved at the time of the abortion. If the abortion was a simple medicated abortion, it will have no effect on this labor; if the last abortion was a curettage or suction, it may have caused damage to the endometrium itself. After this pregnancy, it depends on the position of the placenta. If the placenta is not implanted at the site of the last endometrial damage, it will have no effect on the delivery; if the placenta is implanted at the site of the last damage, it may cause placental adhesions, and postpartum hemorrhage may occur after the delivery.