Weight gain

Megan

So I'm 21 weeks and had "normal" prepregnancy bmi. I have NOT gained anything yet...i have lost 1 lb overall so far :-( I have no appetite. Any suggestions? Doc wants me to gain but I don't know how. Not my normal questions...last 2 pregnancies I worked hard to stay on track, which I did. I'm just so tired chading 2 kids I think I have no appetite as a result. Any suggestions welcome!