No weight gain at 9 weeks

Jessica
Hi!! 
This is my first baby. I lost 5lbs in weeks 5 and 6 because I was so sick. I gained 1lb back in week 7 and I still haven't gained any weight back, and I'm currently in week 9. I have a healthy appetite, and been constipated and bloated, but no weight gain. Should I be worried?
8 week scan went great. I don't have first doctor appointment until 12/10.
Thanks in advance for your thoughts!