Porcha Woodruff was getting her two daughters ready for school when six police officers showed up at her door in Detroit. They asked her to step outside because she was under arrest for robbery and carjacking.“Are you kidding?” she recalled saying to the officers. Ms. Woodruff, 32, said she gestured at her stomach to indicate how ill-equipped she was to commit such a crime: She was eight months pregnant.Handcuffed in front of her home on a Thursday morning last February, leaving her crying children with her fiancé, Ms. Woodruff was taken to the Detroit Detention Center. She said she was held for 11 hours, questioned about a crime she said she had no knowledge of, and had her iPhone seized to be sear …