Weight loss

I was slightly overweight before getting pregnant and haven’t gained any weight due to morning sickness the entire time. In the last week I have started losing about a pound a day. I find it strange because I have made it 5 days without vomiting, no change in BM, and an increase in appetite and eating. Doctors haven’t been too concerned about weight but have kept an eye on it and always ask about sickness, BM, and diet, but now that I am losing quite quickly I’m curious as to what is going on. Any thoughts?