A Minnesota woman says she didn't know she was pregnant until she went into labor while running a marathon.

Trish Staine, 33, was on mile 9 of the Duluth, Minn., annual Grandma's Half-Marathon Monday when she gave birth to a baby girl, KBJR-TV, Duluth, reported.

Staine's husband, John, said there was no indication his wife was pregnant. She didn't gain weight or show any other symptoms of pregnancy.

The couple named their daughter Mira -- short for miracle. Mira weighed 6 pounds, 6 ounces.