Deputies said two people got into an argument and a woman left for her vehicle, which had a passenger inside.
That is when shots were fired from an AR-style rifle into her Dodge Challenger, WMC-TV reported.
Officials said no one was injured in the shooting, but there were several bullet holes in the vehicle.
The woman was sent to a nearby hospital to get looked at since she is 17 weeks pregnant, WHBQ-TV reported.
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Margerum reportedly told police he owned the gun, but he denied firing any shots.
His bond was set at $500,000.
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