Loss of appetite?

Is anyone else dealing with food aversion? This IS NOT related to nausea, I don't have any of that at all. I just have no appetite. Nothing sounds appealing to me at all, healthy or unhealthy. Prior to pregnancy, I was having a hard time losing weight because I would eat everything in sight. Now, I would kill for an appetite. I eat something small and get full right away. Does anybody know if protein shakes are ok during pregnancy? I'm worried because I'm definitely not eating enough.