I am so sad

I am 17 weeks and feel like I am not eating enough or drinking plenty of water I should be I don't want to be a bad parent but it's hard for me to feed myself late at night if I eat cereal I get hungry again I would eat macaroni it's too much idk been very picky and now I hate it! My stomach haven't got big yet and idk what's going on last time Doctor told me I need to eat it's just stressful and not easy because I am lonely in this world