By Des Bieler, The Washington Post Former Olympic gold medalist Shawn Johnson, who took her husband’s last name after marrying NFL free agent long snapper Andrew East last year, shared an emotional video Saturday relating her recent miscarriage. In the 20-minute video, Johnson took viewers and social-media followers through a wrenching experience that unfolded all too quickly. “The past 48 hours have been some of the happiest, scariest, and saddest times of my life,” Johnson, 25, wrote on the video’s YouTube page.