with my first i put on a stone by the time i was 20 weeks, i didnt bother to weigh myself before then, and by the time i was 40 weeks i'd put on 2 1/2 stone, i was quite upset as i've always been small, but i had a healthy baby boy of 6lb 8 and soon after the weight just fell bak off i was very lucky, and probably down to a bit of stress ( got married when he was 4 months old and had to buy a second wedding dress the 1st one was too small in the chest!!!)was back into most of my old clothes by the time he was 6-7 months old. i'm now 23 + 3 with baby no 2 and haven't really checked my weight but i have the midwife on monday so will weigh myself then. dont forget that a lot of the weight you put on is related to extra blood, boobs, uterus, water, obviuosly baby i think there is more but cant remember but average weight gain is between 2 and 4 stones so 3lb really isnt a lot. i was in maternity clothes at 11 weeks 1st time and at 8 weeks this time!!dont worry about it it will go once baby is born!!!! :\)