I need help!

I had really bad morning sickness in my first trimester. I’m currently 26 weeks today and I still can barely eat anything I have no appetite for anything really but I force myself to eat. I’ve only gain about 5 so far. I had a doctors appointment yesterday and my baby girl weights 1pound 6 ounces and currently measuring 24weeks 5 days from the ultrasound. My doctor didn’t say anything about it but should I be worried ?? Is this normal?? I asked the nurse she said it was fine but idk idk what to think... Has anybody else experienced this or experiencing this ??