This morning, my daughter, Olympia, who turns five this month, and I were on our way to get her a new passport before a trip to Europe. We’re in my car, and she’s holding my phone, using an interactive educational app she likes. This robot voice asks her a question: What do you want to be when you grow up? She doesn’t know I’m listening, but I can hear the answer she whispers into the phone. She says, “I want to be a big sister.”

Olympia says this a lot, even when she knows I’m listening. Sometimes before bed, she prays to Jehovah to bring her a baby sister. (She doesn’t want anything to do with a boy!) I’m the youngest of five sisters myself, and my sisters are my heroes, so this has felt like a moment I need to listen very carefully to.

Believe me, I never wanted to have to choose between tennis and a family. I don’t think it’s fair. If I were a guy, I wouldn’t be writing this because I’d be out there playing and winning while my wife was doing the physical labor of expanding our family. Maybe I’d be more of a Tom Brady if I had that opportunity. Don’t get me wrong: I love being a woman, and I loved every second of being pregnant with Olympia. I was one of those annoying women who adored being pregnant and was working until the day I had to report to the hospital—although things got super complicated on the other side. And I almost did do the impossible: A lot of people don’t realize that I was two months pregnant when I won the Australian Open in 2017. But I’m turning 41 this month, and something’s got to give.