It depends on what your BMI is, if you're in the obese category then losing weight is definitely good for youand the baby.
I've never heard of that, actually quite the opposite! I'm having a really hard 1st tri. I saw my dr last week n had dropped 10lbs due to being sick n unable to keep anything down she told me 10lbs isn't a big deal but when I get around to 15-20lbs lost then that's a red flag. Since that appt I lost another 5lbs=( ill have to go back n see her soon