Prenatals not taking them!

I’m pretty sure my prenatals make me sick, so I’ve kind of decided to not take them. Has anyone else not taken them? Are there any severe side effects for your baby if you don’t take them? I’m a healthy 21 year old who works out and eats good. I just don’t think I need to take them. I know there are women who can’t afford them so they don’t take them and their baby’s are fine? So I just feel like it’s not necessary, especially sense they obviously make me sick!