What about Coenzyme Q10 supplements for pregnant women and breastfeeding mothers, you ask.  Well, yes, that seems to be a logical question.  

Coenzyme Q10 is an essential factor in the cellular process of energy production.  It plays an important role in antioxidantAntioxidants are substances that protect the cells and lipoproteins against the harmful effects of free radicals. They are substances that prevent the oxidation of other molecules and compounds. There are two broad categories of antioxidants: enzymatic and non-enzymatic. Non-enzymatic antioxidants are substances like Coenzyme Q10, vitamin C, vitamin E, glutathione, and various carotenoids. Prominent enzymatic antioxidants include catalase, glutathione peroxidase,... Read more about this term protection of the cells. It helps to maintain good endothelial cell function [Littarru 2010].

And, pregnancy is certainly a time when women need extra energy.  Ditto when they are breastfeeding.  

Similarly, pregnancy and breastfeeding are times of increased oxidative stress and thus increased need for antioxidant protection.  Pre-term mothers and infants, in particular, need extra antioxidant defense [Abuhandan 2015].