overweight and pregnant

According to my BMI, I am overweight. Any tips from other moms who have been overweight when they found out they were pregnant? I was trying to get into shape and thankfully we were able to get pregnant right away so we were shocked! I want to ensure I can stay healthy for the baby. Got all the right foods but worry about gaining weight. Im not that hungry because I'm so bloated so is it ok to not eat as much as they recommend? I've heard some moms have lost weight in first trimester. I am probably going to eat a ton better and workout more than I ever have. Picking up some water aeroibics too!