Has anyone lost fat - on purpose - while pregnant?

Danielle • Pregnant with #2!
Some women and Dr's believe its okay to restrict calories (just a little) while pregnant, as long as the mother eats a very healthy and nutrient rich diet. I know this may be controversial and I totally respect that. Have any of you received any MEDICAL opinions on safe calorie restriction (or forbidding it) from a Dr. Thank you. Have a great day, ladies!