With my 1st pregnancy I lost 15 pounds in the first trimester due to morning sickness. My Obgyn told me not to worry. Baby is pulling in all the nutrients it needs and that is partly why you feel so miserable and lose weight sometimes. My daughter was born 7 pounds and healthy. I ended up gaining what I lost plus 20 by the end of my pregnancy. You and baby should be just fine! Hope you feel better though, morning sickness is so miserable.
Ive lost 3 lbs. I have no morning sickness yet. Mine is just from eating really healthy and chasing my 8 months old around now that she is crawling. As long as you are eating healthy when you can get food down you should be fine. :) I would still bring it up at your first appt so they can monitor you! Congrats tho!