rupture leading embryo grows depression management emotionally challenging hypovolemic shock fallopian tubes fallopian tube left untreated growing embryo abdominal cavity ovary cervix pregnancy due lifethreatening complications heavy bleeding ectopic pregnancy stop bleeding ruptured ectopic pregnancy pregnancy surgery laparoscopy severe internal bleeding ectopic pregnancy occurs early unruptured cases treatment medication methotrexate health complications complications stop cell growth effective emergency care fertilized egg implants