Houston police were called to investigate the scene on Highway 59 at Fountain View.
The 26-year-old woman's body went onto the hood of the car for about 90 feet before investigators say the driver swerved to get her off.
She then rolled another 30 feet before coming to a stop. Paramedics loaded her onto a stretcher and transported her to Memorial Hermann Hospital.
We're told she is at least 12 weeks pregnant. The baby is expected to be okay.
The pregnant woman broke her leg in the incident.
At Fountain View/59 feeder a pregnant woman crossing the street was struck by a vehicle which fled the scene. Victim went to the hospital. #HouNews CC7— Houston Police (@houstonpolice) September 5, 2018
Officers say the victim is possibly homeless and that the car that hit her took off.
Police believe the vehicle may be involved in more hit and run incidents.
"We do have a good suspect vehicle description, and it seems to be matching similar to what our witnesses on the scene are telling us was the same car here," said Houston Police Department Sgt. Thomas Fendia.
The suspect vehicle is a grey or silver Toyota Corolla.
It was last seen on Rampart near Fountain View. Officers have been patrolling apartment complexes in that area as well to try to track it down.
If you have any information, you're urged to contact HPD or Crime Stoppers.