Victoria Ratheram from Shropshire was with her son when she was forced into the nursery that she and her husband had just completed for their second child due in four weeks.
She was then tied to a chair before the house was ransacked.
More top news
Dry overnight, rain by tomorrow afternoon.
Dry with clear spells overnight, cool in rural areas.
"She tried to take hold of the knife to stop him. He told her not to shout out and scream and get on her knees and beg."