Unhealthy Diet

I'm 11 weeks 2 days now and I cannot eat anything healthy at all. Literally I eat pizza almost every single day but that's really the only thing that doesn't make me nauseous. I eat healthy for dinner that's about it(I eat whatever my mom cooks) but throughout the day I'm on my own. For breakfast I eat a bacon egg and cheese or regular bacon and eggs. I'm scared that I'm not giving my baby enough nutrients and that something bad will happen to either the baby or me. Any tips on how I can change this around to have. Healthy rest of my pregnancy. I appreciate any tips or advice . Thanks