"The singer was taken to the hospital and current medical tests conducted indicate that she and the baby are doing fine," Jewel's representative told TMZ.
The Web site cited unnamed sources at the scene as saying a volunteer fire truck collided into the passenger side of Jewel's car.
No other details were immediately available.
The singer, who is the co-host of Bravo's upcoming reality competition show "Going Platinum," married rodeo star Ty Murray in 2008. They announced in January they are expecting their first child.