I don’t want to “starve” my growing baby

so how many times should i eat a day , my appetite changes all the time and some days i’m more hungry than others , i don’t want to under eat .. and i don’t want my lil bun to “starve” i know that sounds so stupid but i just worry i don’t eat enough , maybe you mommies can tell me how often you eat .. sometimes i’m not hungry , or i get full really fast .. but i know i need to eat , it’s hard 😩😩😢 my baby is growing pretty good , he’s only a week under but my dr said it’s because i’m small , any advice though