You should definitely be eating more than 1600 calories a day, you need more than that for your baby and you are supposed to be gaining weight, especially right now when the baby is gaining weight, I think from 34 weeks on they gain like a 1/2 lb a week or something? Eat up hun, you can worry about losing after the baby is born, but don't worry about it right now, it's not good for your little one!