Same here, not much appetite. Last checkup my baby was fine tho, bloodworks too. I am overweight tho, so i have some fat stored up for the baby, i guess. But what i do now is regulary take a light healthy snack, just something small: a few nuts, some raw veggies, salad, dried fruits, a cracker, fruit, ... Choose quality over quantity basically.
I wouldn't worry to much about it. I have absolutely no appetite and my doctor told me to try nuts. It worked for a while but my baby was small too. He told me around the 16th week mark I'm going to start eating everything so if I try shakes and just other things with alot of good stuff in it that by the time I do start eating I'll have a little extra room for weight gain without getting to big. Carrots have been working too. The thought of eating them is sickening but once I chew it's not so bad same things with beans. It'll be ok!!