There is actually a weight gain thing on here. Can't really explain it but if you click home (to where it tells u how many days u have left) there should be an arrow. Click that and look for weight. I am 14 weeks and according to this chart I should have gained between 2 and 6 pounds. If I'm correct tho you should gain 25-35 pounds your whole pregnancy. People that are on the bigger said will gain a little less. I hope you find the weight thing on here, it will help you keep track of your gain :)
I just started gaining weight and I'm 17 weeks. As long as your doctor doesn't say anything I wouldn't be concerned :)
I didn't gain weight until I was 20 weeks . Now I'm 28 weeks and I've gained 15 pounds went from 135-150 So far