Beck sent out a Twitter tweet Saturday announcing she and Miller "lost the baby," the New York Daily News said.
Beck and Miller had announced her pregnancy on Christmas Day.
The sad news broke on the same weekend TMZ.com reported Miller filed paternity suits against two women. One seeks joint custody and child-support from Chanel Johnson, mother of a 4-year-old girl. The other suit seeks joint custody of the unborn child of a woman named Sara McKenna.
Miller is taking the 2013 World Cup season off in order to fully recover from knee surgery before the 2014 Winter Olympics, the Daily News said.