Nausea & low appetite

My first 10 weeks of pregnancy was okay with no nausea but i feel more lethargic than usual. But from week 11 onwards, my appetite got smaller and i vomit everytime i ate something. Is this normal? Im worried that my baby may not have enough nutrients. This week is my week 12 and i depend on fruits and milk to get through the day. I still feel nausea and it was affecting my work. Luckily, my boss was understanding and allowed me to wfh. Will this feeling goes away in a few weeks? #firsttimemom