Not eating much in second trimester

Katlyn • Firefighter wife👨‍🚒 step mother👩‍👧baby girl due 9-4-2018. ❤️

I feel my baby isn’t getting enough nutrients because I always feel so nauseous so I don’t want to eat that much and when I do eat I can’t eat a lot at one time because I get so full. I take my prenatals everyday. Is anyone else having this problem of not eating that much? I’ll be 19weeks on Friday