My sister in law was struggling to eat and she just saw her midwife, she just said eat as much as you can and listen to your body because it will tell you what you need
If you can eat little by little the most important thing is keeping hydrated so as long as you're drinking plenty and having nibbles here and there I wouldn't worry :) I found it a struggle to eat the 1st trimester 😛
The baby really doesn't need you to eat lots of food as they tend to get what they need from your stores. As long as your drinking plenty baby will be fine x