A pregnant woman, her husband and her baby were rescued early Tuesday morning from a fire that consumed two apartments and displaced residents in another six units.A cigarette ignited an oxygen line and fueled a fire at 1215 E. Fifth St. No one was hurt. The fire started about 1:30 a.m., Carson City Battalion Chief John Arneson said. When firefighters arrived, the lower apartment was engulfed. Flames were “blowing out of every window and the doors,” he said. Flames also were reaching the unit directly above.“The first floor exploded, helping to get the second floor going,” Arneson said.The woman, her …