I'm 15 1/2 weeks and haven't gained any weight yet. My doctor said not to worry about it at my last appointment, but I was reading that you should be gaining 4 pounds a month in the second trimester. Just wondering if anyone else didn't gain much weight till later? I have a small bump so things are definitely growing but I guess whatever is in there doesn't weigh much! I'm not complaining, just wondering if others had similar experiences. I'm trying to up my calorie intake and am eating well.