Do you have morning sickness? I lost weight too when i was in my first trimester,my doctor told me to keep doing my daily walks that it was fine and now I'm 20w and so far I've gained 5 pounds. If your doctor isn't concerned then you shouldn't worry (:
Its Normal To Lose Weight During The Beginning Of Your Pregnancy , It Happened To Me As Well
Nah not really normal! Your doctor should be concerned about that & give you some ideas on how to keep food down.
I have some morning sickness but not to much. Its starting to worry me because I'm not 13 weeks and down almost 15 pounds