There is no way that I need new underwear already. I just went and baught some new ones. I used to be a Xs, small. So I got medium and 1 large and the mediums are still leaving me marks. There is no way I'm a large. I'm only 125 pounds. I can see why some girls have weight issues. I should be fitting into a small at 125 pounds not a large. 125 pounds isn't really that much. This is BS.
maybe it's just your hips widening for birth?
my sister had the same thing happen and she was still super skinny she didn't even start showing until 7 months with her first baby.