Don't worry. My case is worse than yours. In week 9, my weight is 135lbs, until yesterday, (week 39), I only gain 7 lbs which is only 142lb, Both priviate and government said it's not a problem as my baby is growing healthily inside and the dr. estimate my baby weigh about 7lbs (medium size BB). He said I don't need to worry about keeping fit after delivery. For me, it's a good news.