Is it dangerous to lose weight in pregnancy?
You may find that, if you are conscious about eating a healthy balanced diet in pregnancy that you lose weight without much effort. Or that you only put on a small amount of baby weight, then once you give birth, you will notice that you are less than you were when you started.

With all 3 of my pregnancies, it was the only time I was really following a totally well balanced healthy eating approach.......(when I am not pregnant/breastfeeding I tend to snack on a lot of crap!) I only gained around 6kg in each pregnancy, then when I gave birth, found that I had dropped around 15kg.....then breastfeeding made me lose more too.....

So to answer your question, don't put yourself on a "weight loss diet", just eat what you know is healthy for you and your baby..........(for me, I knew that no baby ever needed a Crunchie bar or a can of Pringles.......LOL!)