Mineral makeup can be considered generally safe for use during pregnancy. However, it is hugely dependent on the formula of the product you are using, as some beauty products may still include harsh ingredients or toxic chemicals, and even get away with not listing it at times.
You’ll want to make sure you are using mineral makeup from a brand you trust with a full ingredient deck you feel safe using. Don’t hesitate to reach out to the company you are buying your product from if you are wanting more information on their product you are interested in.