"You just have to make that your number one priority. You see each other when you can and you talk to each other as much as you can. You just have to commit and make it work," Underwood told people.com.
The couple is excited to have children and she admitted that while timing is a concern, they are happy to go with the flow.
"There is always something new to look forward to and something new to plan. (Having a baby) will just happen when it happens," said the 30-year-old.