Copper in prenatal?

Megan • 26 years old
I recently had to switch my prenatal vitamins because the ones I had were making me entirely too sick and I threw them up. I am worried about the ones I have now. They have the folic acid, iron, B vitamins, etc that I need but they also contain 2mg of copper. Why is that? Will it hurt me? I have never seen this before. Any input welcome!