I think as long as you aren't actually hungry you're fine! It's normal to not have an appetite during pregnancy at times. Trust me. If your babies need something they will take it from your body first! Whatever vitamin you lack you may start to crave foods that have that vitamin. If your doctors aren't concerned and haven't said anything about your babies development then you're okay! It still is early on in your pregnancy also. Your appetite may increase later!
As long as you're eating small meals they should be fine. I'm 35 weeks with twins nd in the beginning I had no appetite at all nd eventually it picked up. Be sure to stay hydrated nd take your vitamins.