Rawhead Rex has the scene of the woman preparing a meal with detailed close ups of disgusting raw meat, and the monster does burst in on her. However, she does not get slaughtered. The monster sees that she's pregnant, feels of her belly, and then ... it cuts to another scene.
Skip to about 5:30 to watch the whole scene from the beginning. Close ups of meat starting around 6:50, the monster finally breaks in and starts terrifying the wife around 8:35. You'll have to go to the start of part 3 to see him look at her belly and wander off.