Is a woman required to offer expiation (kaffara) or anything else if she miscarries in the third month due to unintentionally carrying something heavy?

A fetus that has reached three months has not yet had the soul breathed into it. There is no sin upon a woman whose fetus miscarries unintentionally. As for expiation (kaffarah) and blood money (diyah), there is a difference of opinion concerning them.