Hundreds of mourners, including Gov. Michael S. Dukakis and Boston Mayor Raymond L. Flynn, packed a church for the emotional funeral of a pregnant woman slain during a robbery. Friends and family at a Medford church read messages of love and grief over the loss of Carol Stuart, 30. Stuart was seven months pregnant when she and her husband were abducted, robbed and shot Monday. Charles Stuart remained hospitalized in stable condition with a bullet wound to the abdomen. Carol Stuart was shot in the head and died that night after a son, who has been named Christopher, was delivered by Cesarean section.