Ask your doctor
Oxytocin
Uterine fibroids refer to benign tumors that start in the uterus. They are the same smooth muscle fibers as the uterine wall but they are denser than normal uterine wall.
Implantation.
about 5cm
Uterine muscle cells help make up the myometrium, which is the inner layer of the uterine wall. These muscle cells aid in inducing uterine contractions. They support stromal and vascular tissue as well.
Yes; this would be known as implantation bleeding that occurs when the fertilized egg implants itself into your uterine wall.
Through the uterine wall
Placenta abruptio or placental abruption is abnormal separation of the placenta from the uterine wall.
Under normal circumstances, a woman who has had a myomectomy will be able to become pregnant, although she may have to deliver via cesarean section if the uterine wall has been weakened.
Implantation
It is the design of the nature to prepare the uterine wall for the expected pregnancy. The uterus sheds the wall during the periods. So that the fresh uterine lining can be prepared in next menstrual cycle.