Final answer:
Placenta Previa occurs when the placenta is implanted lower than it should be and lays over the uterine lining, potentially causing complications during pregnancy.
Step-by-step explanation:
Placenta Previa occurs when the placenta is implanted lower than it should be and lays over the uterine lining. This means that the placenta partially or completely covers the cervix, which can lead to complications during pregnancy. Placenta previa is a condition that can cause profuse vaginal bleeding after week 24 of pregnancy but prior to childbirth.