Mad boyfriend!

Okay so i have a question lady's, i am currently 19 weeks pregnant and i had really bad morning sickness at the beginning of my pregnancy to the point that i lost approximately 15 lbs , well ive been able to eat normally for about a month and a half now, okay well i have only gained 3 lbs. Well my question is am i wrong for not eating alot now that i can eat normally? My boyfriend doesn't understand and makes me feel like im purposely not feeding the baby, he is constantly telling me to eat and that i dont eat enough, and im sick of it! How do i make him understand that im eating plenty and that the baby is fine, he says i dont even look pregnant. Help please!