"Lauren had been craving the funniest types of food (like meatballs in the morning!) and I sensed there was a change in her. She brushed it off but her friend had a few tests left over from when she was trying and she dropped one off at our house."
Arie said Lauren took the test and then went into the kitchen, and he waited in the bathroom to find out the results.
"I was in the bathroom and watched as that window changed to a plus sign. I immediately started to cry. I walked the test into the kitchen and told her, holding the test in my hand. Hilariously, Lauren was in complete shock/denial and we went to the grocery store to get ice cream (another hint) and five more tests just to be sure," Arie revealed.
"We sat up happy and amazed at what's in store for us. Our life has been like a wonderful dream, and just when I thought I couldn't be any luckier, this news came into our lives."
Arie admitted it's "wild" to think he met the love of his life on a reality show.
The couple got engaged during the March 2018 broadcast ofThe Bachelor: After the Final Rose. Arie changed his mind and won Lauren back after proposing to the real winner of Season 22, Becca Kufrin, and dumping her weeks later.
"Now we have this life together," said Arie, who traveled to different countries with Lauren after the show and recently bought a home with her in Phoenix, AZ.
"Soon we'll be husband and wife and not too long after, we'll be parents in June. It seems so surreal in the absolute very best possible way."
Arie and Lauren will be getting married on January 12, 2019 in Maui with their closest family and friends present.
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Looking back on his time as the Bachelor, Arie admitted to Today it was a difficult time in his life, although rewarding.
"In an ultra-produced show with so many moving parts, I found it hard to be myself. Ultimately, I made the wrong decision in front of millions watching at home. With space to think and time away from the show I knew where my heart belonged, and I am so thankful my now fiancee, Lauren, gave us a chance," Arie explained.
"I'm also thankful I took that leap. I cannot even describe what it is like being the Bachelor. While filming, there is an immense pressure. Hundreds of people are involved in production and it all centers around you. As a person who doesn't like to be the center of attention, this weight is very real."
Arie was also disappointed in the show's editing, as Lauren seemed extremely quiet and shy -- and the end of the season was totally focused on Becca getting her heart broken rather than the race car driver finding his future wife.
"I always describe the experience as reading the best book you've ever read with all the beautiful details and moments you paint in your mind, then watching the movie version and leaving disappointed because so much was left out," Arie confessed.
"This is how I describe my experience -- the focus was on all the wrong parts in the book."
But now that the world is no longer "stuck in the past," as Arie put it, he said his life has returned to "some degree of normalcy."
"Life since the show has been a wild and fun ride, and Lauren hasn't left my side since... I would catch myself looking at her when she wouldn't see me and I would think to myself that being with her is the best decision I've ever made in my life."