Try not to worry sweetie. You don't have to gain much weight to have a healthy baby? Are you a heavier girl? I only ask because when you start out at a higher weight, women often gain very little. When you do eT, make the calories count! Good luck!
My first pregnancy I didnt gain weight till I was about 6-7 months. And I only gained 12lbs. I was very underweight in the beginning I was losing weight. And my daughter cane out pushing 9lbs and is crazy smart 2yr old.
With this pregnancy Im 34W and I've gained 11lbs , but I say as long as your snacking and drinking water or Powerade / Gatorade you should be fine. If your baby's moving dont stress. You don't have to have big meals, with both my pregnancies I lost my appetite completely and my husband gets mad but what can you do if your not hungry? I will chug liquids all day and snack on Lil things . but dont stress it will be fine. EVERY pregnancy is different AMD EVERYONE is different. If your Dr is not freaking out you shouldn't.