(Reuters) – A federal judge on Monday blocked a 2021 Arizona law recognizing the personhood of a fetus from the moment of fertilization, siding with abortion providers who said the measure was too vague and exposed them to prosecution. The Center for Reproductive Rights, which argued on behalf of providers before U.S. District Judge Douglas Rayes last week, also said the provision could conflict with a state law set to take effect this year allowing abortion up to the 15th week of pregnancy. A lawyer for the Arizona attorney general’s office countered that the provision, which says state law m…