Jill Hartle might seem an unlikely advocate for abortion rights, but after a devastating pregnancy loss, she’s raising her voice. A conservative Christian and former Ms. South Carolina, Jill was a Republican until last summer, when in the wake of new abortion restrictions in her state, she endured the “excruciating” experience of terminating a pregnancy with a baby who had a severe heart defect. Because of South Carolina’s abortion laws, Jill and her husband, Matt, had to spend weeks waiting for availability at a clinic out of state, fly there, endure wrenching time away from their family and support system,...