"We tried really hard, so it was a lot of staying home and just doing what you do," The Sun quoted her, as telling Oprah.
She also let on about the number of pregnancy tests it had taken before she got a positive result.
"I'm sort of superstitious, so I saved all of the negative tests in a drawer. Don't ask! I don't know why, but I did. After about 35 tests, we finally got a positive test."
Berry also told Oprah that she and Aubry did not know the sex of their baby, and would be waiting to find out.
"There's so few genuine surprises in life anymore that, why not have a huge surprise? And I like fantasizing one day it's a girl, one day it's a boy," she said.