Feel like I'm not eating enough for baby

Since being pregnant I've lost my appetite. I'm 6 weeks. I have breakfast in the morning so that I can take my folic acid and vitamins. Sometimes then I don't eat for the rest of the day, most times I have a little bit of fruit and that's all. And then I have an evening meal. Most the time I only eat a little bit of that. I don't feel like I'm eating enough to make my baby healthy. Am I right or am I fine?