Postpartum period

1. What is the postpartum period? What is the process of uterine involution after childbirth?  How is postpartum hemostasis achieved?

2. After the report, the nurse goes in to assess Diana. Her vital signs are within normal limits but her fundus is 2 cm above the umbilicus and displaced to the right. Her sanitary pad is completely saturated with lochia rubra. Is this an expected finding 3 hours after birth?