like the others have said every pregnancy is different. With my 1st 11 years ago I gained 56lbs, my 2nd last year I only gained 7lbs and I am 32weeks3days and have only gained 3lbs. Both my boys were in' the healthy 7lb range and so far my lil princess is measuring right on track. Just make sure you take your vitamins and if your doctor is worried they will tell you.
I'm 15 weeks and have lost 8lbs. But my baby is still measuring very healthy in size. I have been told it's normal. And you will gain what you need towards the end
Forgot to add: Just remember slow and steady weight gain and it should come off :0)
As long as your eating healthy I wouldn't worry. Your dr will tell you if he is concerned with your weight gain. I'm the same way as you..I'm 21 weeks and only gained about 4-5 pounds and started at 132. My dr doesn't seem worried as long as I'm eating and not skipping meals.
Every pregnancy is different. With my son I gained 30 pounds. With my 1st daughter I only gained 12. My 2nd daughter I gained 15. My youngest is 33 wks pregnant and has gained 3 pounds so far. My niece is also 33 wks & has gained 18.