Weight gain during pregnancy

Hey guys my one doctor I saw for a cyst on my babies brain told me i was underweight and need to be gaining more. The baby is growing perfect at 29 weeks but she said I should have gained more. I was 5'2 and 106 before I got pregnant and now I'm 117 at 29 weeks. My normal doctor says I'm fine because she knows of my eating disorder history, at this point all I care about is the baby. Did any of you only gain a small amount?