Chrissy Teigen and John Legend recently confirmed that they are expecting their third child. Since revealing her baby bump in the music video for Legend’s new song, “Wild,” the model and cookbook author took to Instagram to show off her new bump. She turned to Twitter to share the details on how she found out she was pregnant.

A curious fan Tweeted: "Question... @chrissyteigen just announced she's pregnant. Before my breast reduction last year, they did a pregnancy test. Was she pregnant when she had her surgery in June? I feel like with her bump she had to be pregnant before that, but I could be wrong. I'm confused."

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Teigen was quick to respond, saying, “Oh, it’s quite a story.” She explained that she did take in fact take the required pregnancy test before her breast implant removal surgery, but that it came back negative. It turned out to be a false negative.

How does that happen? There are a few ways you could get a negative result on a pregnancy test when you are actually pregnant. If you take the test too early, the test may not be able to pick up the pregnancy hormone HCG. There is also a possibility of receiving a false negative result if the urine sample used for the test is diluted. For the most accurate results, it’s best to take the test one week after a missed period, and to take the test first thing in the morning, when your urine is the most concentrated.

Teigen, who didn’t think she could conceive naturally, was shocked to see a positive result after taking another pregnancy test at home a few weeks after her surgery. She admitted to another Twitter follower that she took multiple tests afterwards to confirm her pregnancy. She went on to explain that for many years, she would take a pregnancy test every month in the hopes of finally seeing a positive result. After struggling with infertility for so long, Teigen and Legend opted to try in vitro fertilization. After multiple IVF attempts, Teigen gave birth to daughter Luna in 2016 and son Miles in 2018.

The positive result came on the morning of John Legend's album release. Teigen explained that she woke up early as Legend prepared to go on Good Morning America. She decided to take her usual monthly pregnancy test, fully expecting to be disappointed by yet another negative result. Teigen Tweeted that she didn’t think that she and Legend would be one of the couples that would conceive a “Corona baby” but it turns out they’re going to! All joking aside, Teigen hopes that her story will give couples who are trying to get pregnant some hope, pointing to a common belief that life can surprise you, and that when you give up on or take a break from trying to conceive, it may just happen naturally after all.

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Sources: Insider, Mayo Clinic, Twitter, iHeart