your lucky! I only weight 100 pre-pregnancy and now on my 21weeks I am 112lbs and my doctor and hubbby put me in diet bcoz they said i gain goo much and trying to avoid gestational diabetes. sucks that i feel so crazy and moody without food and now they put me on diet. worst!

Eat several small meals. Try drinking milk with your meals.

Don't worry you will gain more! Just continue to eat healthy for you and baby.