This happened to my grandmother while she was living in Northern Michigan with her sister. The husbands (my grandpa and great-uncle) were off fighting in WWII and their cousin, who was pregnant with her first baby, came to visit as her due date approached because her husband was also fighting. One evening, my grandmother was laying in bed when she heard a blood curdling scream. She and her sister rushed down the hall to see their cousin standing completely motionless, staring into the dining room. She asked them if they saw them on the table. When my grandma looked, she didn't see a thing. The cousin told her she'd seen two coffins, one normal sized, and one the size of a baby coffin, sitting on the dining room table. Six days later, my grandma's cousin died in childbirth, as did the baby.