I was finally diagnosed with hyperemesis for my pregnancy, I lost 13 pounds total, by week 16 I had regained 3 and she told me to come back in 4 weeks. Now I am almost 20 and I have only gained 1 more pound, which still puts me at -9.

At what point do we worry? What are the potential issues? Anything I should ask I particular? Is working out an issue? I am mainly walking but often for 2+ hours a day in addition to general daily activity.