I didn't know I was pregnant until I gave birth

The string of "I didn't know I was pregnant until I gave birth" stories continues. The latest is out of Risca, Wales, and involves 24-year-old Clare Evans.
After experiencing stomach pains she called an off-hours hotline, which advised her that it could be a kidney infection. She then called her doctor's office and was told to come in later that day; when she arrived, she was asked to provide a urine sample.

"But when I went to the toilet, my waters broke," she says. A doctor quickly checked her and was able to see the baby's head, reports the South Wales Argus.
Evans was not only pregnant, she was about to give birth. Evans was 9cm dilated, and gave birth 30 minutes later, at 1:24pm on Oct. 6.
The 6-pound, 12-ounce Erin Louise Roberts was the first baby to be born at the doctors' office in its 30 years of operation. It's the first child for Evans, who, as she put it on Facebook, "didn't have a clue she was there"—no morning sickness, and not even a bump.
But the surprise has been a great one for Evans, who says, "I love motherhood, even though it was completely unexpected I wouldn’t change it for the world." (Earlier this month, an Iowa woman who was also experiencing a mystery stomach pain gave birth to rare twins.) See below.

Twins are rare, occurring in roughly 2% of all pregnancies. Of those, monoamniotic twins—in which the babies share both a placenta and amniotic sac—are even more uncommon, happening in fewer than 1% of all instances of twins. But what makes an Iowa woman's pregnancy absolutely singular is that she was pregnant with monoamniotic twins without knowing it. Shelby Magnani was having stomach pains, particularly a "sharp pain" on her left side, so she went to a walk-in clinic. "They said, 'We think you might be pregnant,'" she tells the station. "They told me I was six months [along] and told me to get down to the ER" for an ultrasound. That's when the Ankeny woman and fiance James Croskey learned it was twins.                                                                
This type of pregnancy is highly complicated: The mortality rate is about 50%, with the biggest worry being that the umbilical cords could get tangled in such a small space—the Children's Hospital of Wisconsin likens the cords to a garden hose, explaining that if they "flatten or bend, the supply line can be damaged or cut off," impeding development or even causing death. Dr. Jennifer Krupp explains that "we bring the patients into the hospital at 24 to 26 weeks, so we can monitor the babies several times a day." But as WHOTV reports, Magnani "missed out on the worst part of having monoamniotic twins: the worry." How fast it happened: On Oct. 6, Croskey posted on Facebook that he was throwing a huge Halloween party; three days later, he posted a request for a ride to Mercy Hospital—followed by an album of his girls. The identical Ava and Anna entered the world via C-section on Thursday, weighing 4 pounds, 6 ounces and 3 pounds, 12 ounces, respectively. Though they'll need to stay in the NICU, they're expected to be fine.