One woman who thought her back pains were related to her running nine miles the night before was surprised to find she was actually in labor.
Trish Staine, 33, of Duluth, Minnesota, said she had no idea she was pregnant, as her husband had a vasectomy. She also had her period every month and seemed to be losing weight with her marathon training.
She already has two children with her husband, and had always been skeptical of women who said they did not know they were pregnant.
Staine went into the hospital with what she thought was a pinched nerve or a kidney stone, but they soon told her she was in labor. She was rushed to the birthing center and gave birth to a healthy baby girl five minutes later.
The new mother was training for a half-marathon on June 22, and said she experienced no usual pregnancy symptoms.
"I didn't gain any weight. I had my period. I had no idea," she said.
On Monday, when she went into labor, she chalked up her pains to the strenuous run she took the day before.
But the pain soon became so severe that she had to be taken to St. Mary's Hospital by ambulance.
"In the ER, they found a fetal heartbeat. I was like, 'No, no, no. There's no way I'm pregnant.' But they rushed me to the birthing center, and five minutes after I got into my room, she was born," Staine said.
She named her daughter Mira, short for Miracle.
Her husband, John, was in disbelief when he arrived at the hospital and was told he had a new daughter.
"It was like a dream. I wanted to make sure it was real," he said, asking the doctor to pinch him.
While most vasectomies performed in the U.S. prevent pregnancies, 11 percent fail.
Though Mira was unexpected, the Staine's are making room for her in their large six-bedroom house.
As for the marathon, John believes she will be able to do it.
"We paid for the [entry fee]. They've already cashed the check," he said.