For the first time ever, Jennifer Aniston has opened up about her struggles to get pregnant, blasting speculation that she was too career-focused to become a mother and that Brad Pitt left her because she refused to have children. Speaking about a painful period of her life an unspecified number of years ago, the 53-year-old “Friends” star told Allure magazine, “I was trying to get pregnant. It was a challenging road for me, the baby-making road.” In the interview that was published Wednesday, Aniston spoke of her struggle to get pregnant. “All the years and years and years of speculation…