Normal??

I don’t want any backlash from this but I’ve been facing a lot of stress lately and now that I’m pregnant and knowing I have to eat more than I usually do it’s harder for me especially because my child’s father doesn’t want to be apart and he’s making it harder for myself. I do eat but I always feel like I get full pretty fast but then I would get headaches and feeling weak. I don’t know what I should do I don’t want to harm my child in any way I just wanted to see if anyone has an opinion or solutions to this.