Retain Placenta

Stjd

I had a baby a week ago and this whole week I was in pain ,cramping and bleeding . Today I had this huge peace of blood and half of the placenta cake out ! Went to the hospital and gave me methergine. Family wants me to sue the doctors . I don’t know what to do as for now as this is really new to me, new baby lack of sleep overwhelmed! Does this happen? Is it common? Do I have a case here?