Movie about time travelling pregnant woman

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Movie before 2010, probably made between 90s-early 00s. a pregnant Widow who travels back in time reliving precious moments of her husband who seems to be some researcher for a company. She ends up being contacted by that company and asked to enter a big machine. Specifically a scene involves chocolate being melted in that big round microwave machine? The most important part of the movie was her travelling back to Christmas time while looking at her special memory with said husband. And at the end, she goes near labor and heads to a van with her mom/mother in law while imagining her husband is there to help encourage her in the snowy night.

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