Need help gaining weight !!

Sequoia • Married ❤️ we have 2 children. Boy (3/10/14) girl (8/25/16). Blessed for sure!
I have to somehow gain 10lbs by my next appointment in 3 weeks .. So attempt #1 here I go 😂 anyone else have ideas ?? I've gotta do whatever I can they are already putting me on moderate risk because of my huge weight loss in only 18 weeks. 😩 I never thought I would be struggling to GAIN weight as I've been a thicker girl since I was 15/16. My total weight loss this far is 35lbs! If I can't gain the weight they are moving me to high risk and ordering a crap load of ultrasounds to check baby's growth just incase my extreme weight loss isn't effecting him! (So far he's a healthy little one :D)