Jessica Biel was "surprised" by how long it took her to get pregnant

Speaking on Good Morning America, she said: "We all know how to have a family, but it's not as easy as we think it is anymore. Sometimes it takes a long time to become pregnant, and that's what I was surprised about with myself and my own knowledge or misinformation about my own body."

Meanwhile, Jessica previously confessed she is Justin "number one fangirl".

She wrote on Instagram: "A picture says a thousand words. And thank goodness because there aren't enough to express ALL the aspects of my love and respect for you. Here's to a spectacular year ahead. I'm so proud of all you've accomplished and all that is ahead for you. plus you're a super hot dad. A ninja dad. A kiddie teeth brushing, Jedi sleep mind tricking, intimidating dad voice disciplining SUPER HOT DAD. I love you, you hot dad.. I'm here, right by your side, OG fan girl #1. Happy birthday, my beloved. Now go crush it this weekend at SB LII. (sic)"

And the 35-year-old actress previously revealed her and Justin's relationship works because they're both "selfish".

Opening up about their "similarities", she added: "We really have a lot of similarities. We believe in loyalty, honesty. We like to have fun. Also, in the business, we’re very career-oriented, and you have to be a little selfish. I understand that about my peers - about being focused and driven - and if you have someone who shares the same values as you, it’s like, 'Score!'"