The following statement about the pregnancy at the cesarean scar site is wrong
选项：

A:Embryo implantation in the scar of cesarean section incision in the lower uterus belongs to ectopic pregnancy;
B: The main method of diagnosis is B-ultrasound;
C:Early exogenous type can cause uterine rupture or hemorrhage, endogenous type has no risk ;
D:For early pregnancy, if there is no abdominal pain, vaginal bleeding is not much, and the pregnancy mass is not ruptured, drug treatment can be selected