Imagine going to the toilet, only to find yourself unexpectedly a first time mum just moments later.
That's exactly how new mum Melissa Surgecoff describes her son Liam's entrance into the world, after the kidney stone she thought she was passing turned out to be a baby.
Incredibly, the 38-year-olf from Massachusetts says she had no inkling she'd been pregnant.
Waking with what she first thought were period cramps, when the pain became severe she asked her fiancé Donnie Campbell to call an ambulance.
But baby Liam arrived before paramedics did, as she told TODAY.
"The only relief I would get was sitting on the toilet," she said. "So I was in the bathroom, and I ... couldn't sit still. I was screaming, I was trying not to be loud like I didn't know what this was."
Soon, she felt something come out of her - and feared something was seriously wrong.
"I look in the toilet and I still didn't know what it was," she said. "And I thought I basically lost an organ because I didn't know!"
It was only when Donnie came over to look that they realised what had happened.
"I'm screaming, I'm freaking out, I'm in shock," she said. "I don't know what's going on, and Donnie went to the toilet, and he rescued the baby."
She also told Today she didn't suspect pregnancy could be behind her recent weight gain or swollen feet, as she'd always had irregular periods and wasn't surprised to go a few months without one.
Those around her, including her fiancé, were equally clueless, as he told NBC10 Boston, 'all of a sudden there's a baby in the toilet!'.
After taking Liam to the hospital to be checked over, he was declared healthy and the couple were able to bring him home after a few days.
As Melissa told NBC10, while his arrival had been a huge shock, they felt grateful to have him safely home.
"We always wanted our ducks in a row, get married, move out, have the right jobs," she said of the couple's plans to start a family.
"It's amazing now, I wouldn't change it for anything."