The House voted to accept minor changes made by the Senate.
Mills was asked if the bill establishes that the embryo is a person.
"My own personal belief is that it is a person," Mills said.
The bill defines an embryo as an individual fertilized ovum of the human species from the single-cell stage to eight-week development.
Mills believes the bill would be the first of its kind in the nation and has the potential of setting a precedent that an embryo is a person.
The bill now goes to the governor for his signature.