Asked if she and husband Mike Comrie are talking about parenthood, Duff said on the Valentine in the Morning radio show Friday, "We're not. We're not thinking about it at all."
But, she added, that doesn't rule out a big brood down the road.
"We're excited to have kids," Duff, 22, said. "But we don't want to do it now. We've been married for six weeks. We haven't sent thank-you notes out yet. Can we get that out of the way before?"
Duff and Canadian hockey player Comrie, 29, exchanged vows in Santa Barbara, Calif., in August.
The singer, who started her career as a child star working with Disney, also spoke about the challenges today's young stars face. "It's hard," Duff said of the entertainment business. "I would never just march up to Miley Cyrus and say, 'I got some stuff to share with you.' I think they're doing a good job."